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Income taxes - Provision for Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Taxes calculated using the estimated annual effective tax rate	$ 322	$ 164	$ 597	$ 330
Discrete tax items	(11)	(265)	(100)	(381)
Provision for income taxes	$ 311	$ (101)	$ 497	$ (51)
Effective tax rate	14.00%	(8.00%)	12.00%	(2.00%)

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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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