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Financing arrangements - Schedule of Debt Issuances (Details) - Notes - USD ($) $ in Millions	Dec. 31, 2024	Mar. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Principal Amount	$ 0	$ 24,000	$ 7,000
5.25% 2025 Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.25%
Principal Amount		2,000
5.507% 2026 Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.507%
Principal Amount		1,500
5.15% 2028 Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.15%
Principal Amount		3,750
5.25% 2030 Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.25%
Principal Amount		2,750
5.25% 2033 Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.25%
Principal Amount		4,250
5.60% 2043 Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.60%
Principal Amount		2,750
5.65% 2053 Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.65%
Principal Amount		4,250
5.75% 2063 Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.75%
Principal Amount		$ 2,750

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