Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Numerator:
Net income	$ 548	$ 1,031	$ 2,065	$ 2,059
Denominator:
Basic: Weighted-average common shares outstanding (in shares)	110.5	116.4	112.1	118.2
Effect of potentially dilutive nonqualified stock options and other share-based awards (in shares)	2.2	2.8	2.3	2.7
Diluted: Weighted-average common shares outstanding (in shares)	112.7	119.2	114.4	120.9
Earnings per share:
Basic (in dollars per share)	$ 4.96	$ 8.86	$ 18.42	$ 17.42
Diluted (in dollars per share)	$ 4.86	$ 8.65	$ 18.05	$ 17.03
Options excluded from earnings per share calculation due to their anti-dilutive effect (in shares)	0.0	0.0	0.2	0.0