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Income taxes (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 395	$ 404	$ 336	$ 1,099	$ 990
Effective tax rate	21.30%	22.00%	22.00%
Tax reserves	$ 104			104		$ 109
Impact on effective tax rate if tax reserves were unnecessary	104			104
Accrued interest, related to income taxes in the balance sheet	$ 35			35
Additional tax benefit (expense) related to interest				$ 6	$ 0

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