Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Numerator:
Net income available to common stockholders	$ 518	$ 542
Denominator:
Denominator for basic earnings per share—weighted-average common shares (in shares)	65,335	67,213
Effect of dilutive securities:
Denominator for diluted earnings per share—adjusted weighted-average common shares (in shares)	65,435	67,417
Basic earnings per share (in dollars per share)	$ 7.92	$ 8.06
Diluted earnings per share (in dollars per share)	$ 7.91	$ 8.04
Employee stock options
Effect of dilutive securities:
Effect of dilutive securities (in shares)	2	3
Restricted stock units
Effect of dilutive securities:
Effect of dilutive securities (in shares)	98	201