Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2025	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Numerator:
Net income available to common stockholders	$ 653	$ 701	$ 622	$ 518	$ 689	$ 708	$ 636	$ 542	$ 2,494	$ 2,575	$ 2,424
Denominator:
Denominator for basic earnings per share—weighted-average common shares (in shares)									64,439	66,345	68,470
Effect of dilutive securities:
Denominator for diluted earnings per share—adjusted weighted-average common shares (in shares)									64,604	66,567	68,710
Basic earnings per share (in dollars per share)	$ 10.30	$ 10.93	$ 9.59	$ 7.92	$ 10.50	$ 10.73	$ 9.56	$ 8.06	$ 38.71	$ 38.82	$ 35.40
Diluted earnings per share (in dollars per share)	$ 10.27	$ 10.91	$ 9.59	$ 7.91	$ 10.47	$ 10.70	$ 9.54	$ 8.04	$ 38.61	$ 38.69	$ 35.28
Employee stock options
Effect of dilutive securities:
Share-based payment arrangements (in shares)									1	2	4
Restricted stock units
Effect of dilutive securities:
Share-based payment arrangements (in shares)									164	220	236