Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Numerator:
Net income available to common stockholders	$ 689	$ 708	$ 636	$ 542	$ 679	$ 703	$ 591	$ 451	$ 2,575	$ 2,424	$ 2,105
Denominator:
Denominator for basic earnings per share—weighted-average common shares (in shares)									66,345	68,470	70,703
Effect of dilutive securities:
Denominator for diluted earnings per share—adjusted weighted-average common shares (in shares)									66,567	68,710	70,973
Basic earnings per share (in dollars per share)	$ 10.50	$ 10.73	$ 9.56	$ 8.06	$ 10.04	$ 10.30	$ 8.60	$ 6.50	$ 38.82	$ 35.40	$ 29.77
Diluted earnings per share (in dollars per share)	$ 10.47	$ 10.70	$ 9.54	$ 8.04	$ 10.01	$ 10.29	$ 8.58	$ 6.47	$ 38.69	$ 35.28	$ 29.65
Employee stock options
Effect of dilutive securities:
Share-based payment arrangements (in shares)									2	4	4
Restricted stock units
Effect of dilutive securities:
Share-based payment arrangements (in shares)									220	236	266