Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Numerator:
Net income available to common stockholders	$ 451	$ 367
Denominator:
Denominator for basic earnings per share—weighted-average common shares (in shares)	69,414	72,372
Effect of dilutive securities:
Denominator for diluted earnings per share—adjusted weighted-average common shares (in shares)	69,745	72,684
Basic earnings per share (in dollars per share)	$ 6.50	$ 5.07
Diluted earnings per share (in dollars per share)	$ 6.47	$ 5.05
Employee stock options
Effect of dilutive securities:
Effect of dilutive securities (in shares)	4	4
Restricted stock units
Effect of dilutive securities:
Effect of dilutive securities (in shares)	327	308