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Financing arrangements - Debt Issuances and Acquisition-Related Financing (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Oct. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal Amount | $ 0 |  |  | $ 24,000 | $ 7,000
Notes | 3.00% notes due 2029 (3.00% 2029 Notes) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal Amount |  |  |  |  | $ 750
Interest rate, stated percentage | 3.00% |  |  |  | 3.00%
Notes | 4.05% notes due 2029 (4.05% 2029 Notes) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal Amount |  |  |  |  | $ 1,250
Interest rate, stated percentage | 4.05% |  |  |  | 4.05%
Notes | 3.35% notes due 2032 (3.35% 2032 Notes) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal Amount |  |  |  |  | $ 1,000
Interest rate, stated percentage | 3.35% |  |  |  | 3.35%
Notes | 4.20% notes due 2033 (4.20% 2033 Notes) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal Amount |  |  |  |  | $ 750
Interest rate, stated percentage | 4.20% |  |  |  | 4.20%
Notes | 4.20% notes due 2052 (4.20% 2052 Notes) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal Amount |  |  |  |  | $ 1,000
Interest rate, stated percentage | 4.20% | 4.20% |  |  | 4.20%
Notes | 4.875% notes due 2053 (4.875% 2053 Notes) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal Amount |  |  |  |  | $ 1,000
Interest rate, stated percentage | 4.875% |  |  |  | 4.875%
Notes | 4.40% notes due 2062 (4.40% 2062 Notes) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal Amount |  |  |  |  | $ 1,250
Interest rate, stated percentage | 4.40% | 4.40% |  |  | 4.40%
Variable Rate Component Three | Term Loan Credit Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread on variable rate | 1.225% |  |  |  |
Horizon Therapeutics |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Term loan credit agreement, total amount |  |  |  |  | $ 4,000
Term loan credit agreement, total borrowed |  |  | $ 4,000 |  |
Repayments of term loan credit agreement | $ 2,200 |  |  |  |
Term loan, outstanding | $ 1,800 |  |  |  |

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