Income taxes (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Income Tax Disclosure [Abstract]
Income tax benefit	$ 27	$ 46
Effective income tax rate	18.60%	34.60%

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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+ Details