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Financing arrangements - Debt Repayments (Details)	12 Months Ended
Financing arrangements - Debt Repayments (Details)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2023 CHF (SFr)	Mar. 31, 2023 USD ($)
Debt Instrument [Line Items]
Repayments of debt	$ 3,600,000,000	$ 1,454,000,000	$ 0
Notes
Debt Instrument [Line Items]
Repayments of debt			0
Principal amount	0		$ 7,000,000,000		$ 24,000,000,000
Term loan due April 2025 \| Notes
Debt Instrument [Line Items]
Repayments of debt	2,000,000,000.0
Term loan due October 2026 \| Notes
Debt Instrument [Line Items]
Repayments of debt	200,000,000
3.625% notes due 2024 (3.625% 2024 Notes) \| Notes
Debt Instrument [Line Items]
Repayments of debt	$ 1,400,000,000
Interest rate, stated percentage	3.625%
2.25% Notes Due 2023 \| Notes
Debt Instrument [Line Items]
Interest rate, stated percentage		2.25%		2.25%
Principal amount		$ 750,000,000
0.41% Notes Due 2023 \| Cross-currency swap contract (losses) gains \| Cash flow hedge
Debt Instrument [Line Items]
Notional amounts		$ 704,000,000
0.41% Notes Due 2023 \| Notes
Debt Instrument [Line Items]
Interest rate, stated percentage		0.41%		0.41%
Principal amount \| SFr				SFr 700,000,000