Income Taxes - Significant Components of Provision for Income Taxes Attributable to Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current income tax provision:
Federal taxes	$ 2,173	$ 1,676	$ 1,207
State taxes	485	370	301
International taxes	152	67	129
Total current provision	2,810	2,113	1,637
Deferred income tax provision (benefit):
Federal taxes	490	(1,357)	(222)
State taxes	91	(266)	(45)
International taxes	24	(4)	(29)
Total deferred provision (benefit)	605	(1,627)	(296)
Total income tax provision	$ 3,415	$ 486	$ 1,341