Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended				6 Months Ended				12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022		Jun. 30, 2021	Jun. 30, 2023	Jun. 30, 2022		Jun. 30, 2021	Dec. 31, 2022	Dec. 31, 2021
Numerator:
Net income, basic	$ 890	$ 614			$ 1,307	$ 1,439
Net income, diluted	$ 890	$ 614			$ 1,307	$ 1,439
Denominator:
Basic: Weighted-average common shares outstanding (in shares)	106.4	112.3			107.1	113.0
Effect of potentially dilutive nonqualified stock options and other share-based awards (in shares)	2.0	2.1			2.1	2.3
Diluted: Weighted-average common shares outstanding (in shares)	108.4	114.4			109.2	115.3
Earnings per share:
Basic (in dollars per share)	$ 8.36	$ 5.47	[1]	$ 3.01	$ 12.20	$ 12.73	[1]	$ 15.04	$ 28.29	$ 29.13
Diluted (in dollars per share)	$ 8.21	$ 5.37	[1]	$ 2.94	$ 11.97	$ 12.48	[1]	$ 14.72	$ 27.70	$ 28.48
Options excluded from earnings per share calculation due to their anti-dilutive effect (in shares)	0.0	0.0			0.2	0.2

[1] Certain prior period amounts have been restated. See Note 3 for more information.