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Financing arrangements - Debt Repayments (Details) $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 CHF (SFr)	Mar. 31, 2023 USD ($)
Debt Instrument [Line Items]
Repayments of debt	$ 5,000	$ 3,600	$ 1,454
Notes
Debt Instrument [Line Items]
Repayments of debt	$ 500	3,600
Principal Amount					$ 24,000
1.9000 % Notes Due 2025 \| Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	1.90%
5.250% Notes Due 2025 \| Notes
Debt Instrument [Line Items]
Repayments of debt	$ 2,000
Interest rate, stated percentage	5.25%
3.125% notes due 2025 (3.125% 2025 Notes) \| Notes
Debt Instrument [Line Items]
Repayments of debt	$ 1,000
Interest rate, stated percentage	3.125%
5.507% Notes Due 2026 \| Notes
Debt Instrument [Line Items]
Repayments of debt	$ 1,500
Interest rate, stated percentage	5.507%
Term Loan Due April 2025 \| Notes
Debt Instrument [Line Items]
Repayments of debt		2,000
Term loan due October 2026 \| Notes
Debt Instrument [Line Items]
Repayments of debt		200
3.625% Notes Due In 2024 \| Notes
Debt Instrument [Line Items]
Repayments of debt		$ 1,400
Interest rate, stated percentage		3.625%
0.41% Notes Due 2023 \| Cross-currency swap contract gains (losses) \| Cash flow hedge
Debt Instrument [Line Items]
Notional amounts			$ 704
0.41% Notes Due 2023 \| Notes
Debt Instrument [Line Items]
Interest rate, stated percentage			0.41%	0.41%
Principal Amount			$ 1,500	SFr 700,000,000
2.25% Notes Due 2023 \| Notes
Debt Instrument [Line Items]
Repayments of debt			$ 750
Interest rate, stated percentage			2.25%	2.25%