Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended				9 Months Ended				12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022		Sep. 30, 2021	Sep. 30, 2023	Sep. 30, 2022		Sep. 30, 2021	Dec. 31, 2022	Dec. 31, 2021
Numerator:
Net income, basic	$ 872	$ 1,061			$ 2,179	$ 2,500
Net income, diluted	$ 872	$ 1,061			$ 2,179	$ 2,500
Denominator:
Basic: Weighted-average common shares outstanding (in shares)	104.9	110.5			106.4	112.1
Effect of potentially dilutive nonqualified stock options and other share-based awards (in shares)	2.2	2.2			2.1	2.3
Diluted: Weighted-average common shares outstanding (in shares)	107.1	112.7			108.5	114.4
Earnings per share:
Basic (in dollars per share)	$ 8.31	$ 9.60	[1]	$ 7.96	$ 20.48	$ 22.30	[1]	$ 22.99	$ 28.29	$ 29.13
Diluted (in dollars per share)	$ 8.14	$ 9.41	[1]	$ 7.77	$ 20.08	$ 21.85	[1]	$ 22.47	$ 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.