Stock Compensation - Effects on Cash Flows (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Payment Arrangement [Abstract]
Proceeds from common stock transactions	[1]	$ 377	$ 470	$ 539
Tax benefit realized from stock compensation		175	195	224
Reduction to deferred tax asset		(39)	(44)	(49)
Excess tax benefit for stock compensation		136	151	175
Taxes paid for employee shares withheld		$ 53	$ 53	$ 52

[1] Net of taxes paid for employee shares withheld of $53 million, $53 million and $52 million in 2021, 2020 and 2019, respectively.