Entity tax identification number Entity Tax Identification Number Rollover contributions EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Maximum Maximum [Member] Legal Entity [Axis] Legal Entity [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] EBP, Description of Plan [Table] EBP, Description of Plan [Table] Mutual funds Mutual Fund [Member] Other investments EBP, Other Investment [Member] EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Accounting Standard Update and Change in Accounting Principle [Table] EBP, Accounting Standard Update and Change in Accounting Principle [Table] Participant compensation matched, non-elective, percentage EBP, Employer Contribution, Non-Elective Contribution, Percentage EBP, Employer Contribution, Non-Elective Contribution, Percentage Total expenses per the financial statements EBP, Change in Net Asset Available for Benefit, Decrease Self-directed brokerage accounts EBP, Self-Directed Brokerage Account [Member] Maximum borrowing amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount Fair Value Measurements EBP, Investment, Fair Value and NAV [Text Block] General loan, borrowing term EBP, Note Receivable From Participant, General Loan, Maximum Borrowing Term EBP, Note Receivable From Participant, General Loan, Maximum Borrowing Term Investments at fair value Total investments at fair value EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value Maximum contribution to Amgen stock, percentage EBP, Participant Contribution, Maximum Contribution Percentage to Employer Stock EBP, Participant Contribution, Maximum Contribution Percentage to Employer Stock Quoted prices in active markets for identical assets (Level 1) Fair Value, Inputs, Level 1 [Member] EBP, Reconciliation of Financial Statement to Form 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Table Text Block] EBP, Investment, Fair Value and NAV [Abstract] Total assets EBP, Asset Assets EBP, Asset [Abstract] Statistical Measurement [Axis] Statistical Measurement [Axis] Additions to (deductions from) net assets: EBP, Change in Net Asset Available for Benefit, Increase [Abstract] EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Table] Total expenses per the Form 5500 EBP, Form 5500 Caption, Total Expenses Total liabilities EBP, Liability Amendment Flag Amendment Flag Deemed loans EBP, Reconciliation to Form 5500, Net Asset Available for Benefit, Deemed Distribution EBP, Basis of Accounting EBP, Basis of Accounting [Policy Text Block] EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Table] Other – principally due from broker EBP, Investment Sale, Receivable Maximum vesting age EBP, Employer Contribution Maximum Vesting Age Maximum Vesting age of participant for company contribution and/ or investment earning in Company Matching Contributions, Fixed Rate Contributions, Discretionary Profit-Sharing Contributions, Qualified Non-Elective Contributions, and Disability Contributions. Capital Preservation Asset Class: Capital Preservation Asset [Member] Capital Preservation Asset Class: EBP, Description of Plan and Accounting Change [Abstract] EBP, Investment, Fair Value and NAV EBP, Investment, Fair Value and NAV [Table Text Block] Investments [Domain] Investments [Domain] Use of Estimates EBP, Use of Estimate [Policy Text Block] U.S. Equity Index Asset U.S. Equity Index Asset [Member] U.S. Equity Index Asset Schedule H, line 4i – Schedule of Assets (Held at End of Year) EBP, Schedule of Asset Held for Investment [Text Block] Cover [Abstract] Amounts allocated to withdrawing participants Amounts allocated to withdrawing participants at December 31, 2025 EBP, Reconciliation to Form 5500, Net Asset Available for Benefit, Allocation to Withdrawing Participant, Not yet Paid Employer contributions EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash Amounts allocated to withdrawing participants at December 31, 2025 EBP, Reconciliation to Form 5500, Payment to Participant, Decrease from Allocation to Withdrawing Participant, Paid Minimum Minimum [Member] Investment Type [Axis] Investment Type [Axis] Interest income on notes receivable from participants EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Participant contributions EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover Net realized/unrealized gains EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment Interest and dividend income EBP, Change in Net Asset Available for Benefit, Increase from Interest and Dividend Income on Investment EBP, Description of Plan [Line Items] EBP, Description of Plan [Line Items] Number of asset classes EBP, Number of Asset Classes EBP, Number of Asset Classes Plan number EBP, Plan Number EBP, Investment, Fair Value and NAV [Line Items] EBP, Investment, Fair Value and NAV [Line Items] EBP, Description of Plan EBP, Description of Plan [Text Block] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Statement of Net Asset Available for Benefit [Table] Deemed loans at December 31, 2024 EBP, Reconciliation to Form 5500, Change in Net Asset Available for Benefit, Prior Period, Increase from Deemed Distribution EBP, Schedule of Asset Held for Investment [Line Items] EBP, Schedule of Asset Held for Investment [Line Items] Amgen stock EBP, Employer, Common Stock [Member] EBP, Schedule of Asset Held for Investment [Abstract] EBP, Form 5500 Caption, Net Assets [Abstract] EBP, Form 5500 Caption, Net Assets [Abstract] Investment, Identifier [Axis] Investment, Identifier [Axis] Investment and administrative fees EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Grand Total EBP, Asset Held for Investment Vesting period EBP, Employer Contribution Vesting Service Period Minimum Vesting service period for company contribution and/ or investment earning to the participant in Company Matching Contributions, Fixed Rate Contributions, Discretionary Profit-Sharing Contributions, Qualified Non-Elective Contributions, and Disability Contributions. Risks and Uncertainties EBP, Risk and Uncertainty [Policy Text Block] Document Information [Line Items] Document Information [Line Items] Participant compensation matched, percentage EBP, Employer Contribution, Participant Compensation Matched, Percentage EBP, Statement of Change in Net Asset Available for Benefit [Abstract] Significant other observable inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Involuntary cash-out limit EBP, Involuntary Cash-out Limit EBP, Involuntary Cash-out Limit Common and preferred stocks Equity Securities [Member] Maximum number of loans outstanding EBP, Number of Loans Outstanding, Maximum EBP, Number of Loans Outstanding, Maximum Deemed loans at December 31, 2025 EBP, Reconciliation to Form 5500, Change in Net Asset Available for Benefit, Current Period, Decrease from Deemed Distribution Automatic deferral rate, annual increase EBP, Participant Contribution, Automatic, Annual Increase Deferral Rate Annual increase in percentage of eligible compensation contributed for participant automatically enrolled in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) until the contribution reaches maximum threshold. EBP, Tax Status [Table] EBP, Tax Status [Table] Net increase EBP, Change in Net Asset Available for Benefit, Increase (Decrease) Party-in-Interest Transactions EBP, Related Party and Party-in-Interest Transactions [Text Block] EBP, Related Party and Party-in-Interest Transactions [Abstract] International Equity Index Asset International Equity Index Asset [Member] International Equity Index Asset EBP, Accounting Policy, Accounting Standard Update, and Change in Accounting Principle [Abstract] Automatic deferral rate EBP, Participant Contribution, Automatic, Deferral Rate Benefits paid EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Total EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] EBP, Form 5500 Caption [Abstract] EBP, Form 5500 Caption [Abstract] Primary residence, borrowing term EBP, Note Receivable From Participant, Account, Primary Residence, Maximum Borrowing Term EBP, Note Receivable From Participant, Account, Primary Residence, Maximum Borrowing Term EBP, Statement of Net Asset Available for Benefit [Abstract] Other – principally due to broker EBP, Liability for Investment Purchase EBP, Tax Status [Abstract] EBP, Reconciliation of Financial Statement to Form 5500 [Table] EBP, Reconciliation of Financial Statement to Form 5500 [Table] EBP 001 EBP 001 [Member] EBP 001 EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] Reconciliation of Financial Statements to the Form 5500 EBP, Reconciliation of Financial Statement to Form 5500 [Text Block] Notes Receivable from Participants* EBP, Asset Held for Investment, Participant Loan, after Deemed Distribution Fair Value Measurement, Investment Income and Losses and Due from/to Brokers EBP, Investment [Policy Text Block] Total Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Number of amendments EBP, Number Of Amendments Made To Plan EBP, Number Of Amendments Made To Plan EBP, Accounting Standard Update and Change in Accounting Principle [Line Items] EBP, Accounting Standard Update and Change in Accounting Principle [Line Items] Document Type Document Type Entity Central Index Key Entity Central Index Key Break in service period EBP, Employer Contribution Vesting Service Period, Break in Service EBP, Employer Contribution Vesting Service Period, Break in Service Interest Rate EBP, Asset Held for Investment, Participant Loan, Interest Rate EBP, Reconciliation of Financial Statement to Form 5500 [Abstract] Collective trust funds Common Collective Trust [Member] EBP, Tax Status [Line Items] EBP, Tax Status [Line Items] Cash and cash equivalents Cash and Cash Equivalents [Member] Notes receivable from participants EBP, Note Receivable from Participant Fixed Income Index Asset Fixed Income Index Asset [Member] Fixed Income Index Asset Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Summary of Significant Accounting Policies EBP, Summary of Accounting Policy [Text Block] Entity Registrant Name Entity Registrant Name Liabilities EBP, Liability [Abstract] Income Tax Status EBP, Tax Status [Text Block] Maximum borrowing, to total account, percentage EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage Maximum annual compensation to total compensation, percentage EBP, Participant Contribution, Maximum Contribution to Eligible Compensation, Percentage EBP, Participant Contribution, Maximum Contribution to Eligible Compensation, Percentage Document Information [Table] Document Information [Table] Notes Receivable from Participants EBP, Note Receivable from Participant [Policy Text Block] Amounts allocated to withdrawing participants at December 31, 2024 EBP, Reconciliation to Form 5500, Payment to Participant, Increase from Allocation to Withdrawing Participant, Not yet Paid EBP, Related Party and Party-in-Interest Transactions [Line Items] EBP, Related Party and Party-in-Interest Transactions [Line Items] U.S. Equity Active Asset U.S. Equity Active Asset [Member] U.S. Equity Active Asset Significant unobservable inputs (Level 3) Fair Value, Inputs, Level 3 [Member] Net assets available for benefits Net assets available for benefits at beginning of year Net assets available for benefits at end of year Net assets available for benefits per the financial statements EBP, Net Asset Available for Benefit Entity [Domain] Entity [Domain] Fixed Income Active Asset Fixed Income Active Asset [Member] Fixed Income Active Asset Participant Self-Directed Accounts Participant Self-Directed Accounts [Member] Participant Self-Directed Accounts International Equity Active Asset International Equity Active Asset [Member] International Equity Active Asset Net assets per the Form 5500 EBP, Form 5500 Caption, Net Assets Basis spread on variable rate EBP, Participant Loan, Basis Spread On Variable Rate EBP, Participant Loan, Basis Spread On Variable Rate EBP, Investment, Fair Value and NAV [Table] EBP, Investment, Fair Value and NAV [Table] EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Line Items]