Income Taxes - Income Before Income Taxes and Income Tax Provision (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income before income taxes
Domestic	$ 4,179	$ 1,449	$ 1,333
Foreign	1,519	1,317	1,148
Income before income tax expense	5,698	2,766	2,481
Current tax expense:
Federal	533	166	189
State	267	136	124
Foreign	292	264	241
Total	1,092	566	554
Deferred tax expense (benefit):
Federal	258	73	(21)
State	92	(42)	(4)
Foreign	187	61	(8)
Deferred tax expense (benefit)	537	92	(33)
Total income tax expense	$ 1,629	$ 658	$ 521