Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Computation of Basic Earnings Per Share
Net income	$ 752	$ 726	$ 757	$ 630	$ 678	$ 377	$ 2,235	$ 1,685
Shares for basic earnings per share (in shares)	298.6			324.5			303.9	327.0
Basic earnings per shares (in USD per share)	$ 2.52			$ 1.94			$ 7.36	$ 5.15
Computation of Diluted Earnings Per Share
Net income	$ 752	$ 726	$ 757	$ 630	$ 678	$ 377	$ 2,235	$ 1,685
Shares for basic earnings per share (in shares)	298.6			324.5			303.9	327.0
Effect of dilutive securities
Stock-based compensation (in shares)	1.5			1.2			1.4	1.4
Shares for diluted earnings per share (in shares)	300.1			325.7			305.3	328.4
Diluted earnings per share (in USD per share)	$ 2.51			$ 1.94			$ 7.32	$ 5.13