Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current (Expense) Benefit:
Federal	$ (2,355)	$ (2,824)	$ (2,085)
State	(669)	(836)	(425)
Foreign	(343)	(254)	(600)
Current income tax (expense) benefit	(3,367)	(3,914)	(3,110)
Deferred (Expense) Benefit:
Federal	(1,504)	111	(902)
State	(255)	71	15
Foreign	(133)	368	324
Deferred income tax (expense) benefit	(1,892)	550	(563)
Income tax (expense) benefit	$ (5,259)	$ (3,364)	$ (3,673)