Income Taxes - Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current
Domestic	$ 1,987	$ 907	$ 102
Foreign	351	194	320
Total current taxes	2,338	1,101	422
Deferred
Domestic	(839)	(58)	(137)
Foreign	(59)	(2,267)	259
Total deferred taxes	(898)	(2,325)	122
Total income tax expense (benefit)	$ 1,440	$ (1,224)	$ 544