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Financing arrangements - Debt Issuances (Details) - Notes - USD ($) $ in Millions	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Face amount		$ 24,000	$ 7,000	$ 5,000
5.25% 2025 Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.25%
Face amount		2,000
5.507% notes due 2026 (5.507% 2026 Notes)
Debt Instrument [Line Items]
Interest rate, stated percentage	5.507%
Face amount		1,500
5.15% notes due 2028 (5.15% 2028 Notes)
Debt Instrument [Line Items]
Interest rate, stated percentage	5.15%
Face amount		3,750
5.25% notes due 2030 (5.25% 2030 Notes)
Debt Instrument [Line Items]
Interest rate, stated percentage	5.25%
Face amount		2,750
5.25% notes due 2033 (5.25% 2033 Notes)
Debt Instrument [Line Items]
Interest rate, stated percentage	5.25%
Face amount		4,250
5.60% notes due 2043 (5.60% 2043 Notes)
Debt Instrument [Line Items]
Interest rate, stated percentage	5.60%
Face amount		2,750
5.65% notes due 2053 (5.65% 2053 Notes)
Debt Instrument [Line Items]
Interest rate, stated percentage	5.65%
Face amount		4,250
5.75% notes due 2063 (5.75% 2063 Notes)
Debt Instrument [Line Items]
Interest rate, stated percentage	5.75%
Face amount		$ 2,750

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