Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Numerator:
Net income available to common stockholders	$ 636	$ 591	$ 1,178	$ 1,042
Denominator:
Denominator for basic earnings per share—weighted-average common shares (in shares)	66,563	68,718	66,888	69,064
Effect of dilutive securities:
Denominator for diluted earnings per share—adjusted weighted-average common shares (in shares)	66,712	68,841	67,064	69,291
Basic earnings per share (in dollars per share)	$ 9.56	$ 8.60	$ 17.62	$ 15.09
Diluted earnings per share (in dollars per share)	$ 9.54	$ 8.58	$ 17.57	$ 15.04
Employee stock options
Effect of dilutive securities:
Effect of dilutive securities (in shares)	2	4	3	4
Restricted stock units
Effect of dilutive securities:
Effect of dilutive securities (in shares)	147	119	173	223