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Financing arrangements - Debt Extinguishment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Extinguishment of debt, amount	$ 647	$ 297
Gain (loss) on extinguishment of debt	$ 225	$ 78
2.00% notes due 2032 (2.00% 2032 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	2.00%	2.00%
3.15% notes due 2040 (3.15% 2040 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	3.15%
2.80% notes due 2041 (2.80% 2041 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	2.80%	2.80%
3.375% notes due 2050 (3.375% 2050 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	3.375%
3.00% notes due 2052 (3.00% 2052 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	3.00%	3.00%	3.00%
4.20% 2052 Notes | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	4.20%
4.40% 2062 Notes | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	4.40%
2.20% notes due 2027 (2.20% 2027 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	2.20%	2.20%
1.65% notes due in 2028 (1.65% 2028 Notes) | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	1.65%	1.65%	1.65%

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Contractual interest rate for funds borrowed, under the debt agreement.

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