Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator:
Net income	$ 756	$ 591	$ 1,517	$ 1,028
Denominator:
Basic: Weighted-average common shares outstanding (in shares)	112.3	118.4	113.0	119.1
Effect of potentially dilutive nonqualified stock options and other share-based awards (in shares)	2.1	2.8	2.3	2.6
Diluted: Weighted-average common shares outstanding (in shares)	114.4	121.2	115.3	121.7
Earnings per share:
Basic (in dollars per share)	$ 6.73	$ 4.99	$ 13.42	$ 8.63
Diluted (in dollars per share)	$ 6.61	$ 4.88	$ 13.16	$ 8.45
Options excluded from earnings per share calculation due to their anti-dilutive effect (in shares)	0.0	0.0	0.2	0.0