Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Numerator:
Net income available to common stockholders	$ 542	$ 451
Denominator:
Denominator for basic earnings per share—weighted-average common shares (in shares)	67,213	69,414
Effect of dilutive securities:
Denominator for diluted earnings per share—adjusted weighted-average common shares (in shares)	67,417	69,745
Basic earnings per share (in dollars per share)	$ 8.06	$ 6.50
Diluted earnings per share (in dollars per share)	$ 8.04	$ 6.47
Employee stock options
Effect of dilutive securities:
Effect of dilutive securities (in shares)	3	4
Restricted stock units
Effect of dilutive securities:
Effect of dilutive securities (in shares)	201	327