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Income taxes - Provision for Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Taxes calculated using the estimated annual effective tax rate	$ 275	$ 166
Discrete tax items	(89)	(116)
Provision for income taxes	$ 186	$ 50
Effective tax rate	10.00%	4.00%

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

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

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