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Financing arrangements - Debt Issuances in Connection With Proposed Acquisition (Details)	9 Months Ended
	Sep. 30, 2023 USD ($)
Debt Instrument [Line Items]
Face amount	$ 24,000,000,000
Line of Credit | Variable Rate Component One | Secured overnight financing rate
Debt Instrument [Line Items]
Basis spread on variable rate	1.01%
5.25% 2025 Notes | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.25%
Face amount	$ 2,000,000,000
5.507% 2026 Notes | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.507%
Face amount	$ 1,500,000,000
5.15% 2028 Notes | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.15%
Face amount	$ 3,750,000,000
5.25% 2030 Notes | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.25%
Face amount	$ 2,750,000,000
5.25% 2033 Notes | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.25%
Face amount	$ 4,250,000,000
5.60% 2043 Notes | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.60%
Face amount	$ 2,750,000,000
5.65% 2053 Notes | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.65%
Face amount	$ 4,250,000,000
5.75% 2063 Notes | Notes
Debt Instrument [Line Items]
Interest rate, stated percentage	5.75%
Face amount	$ 2,750,000,000

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