Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Numerator:
Net income available to common stockholders	$ 591	$ 493	$ 1,042	$ 860
Denominator:
Denominator for basic earnings per share—weighted-average common shares (in shares)	68,718	71,221	69,064	71,793
Effect of dilutive securities:
Denominator for diluted earnings per share—adjusted weighted-average common shares (in shares)	68,841	71,354	69,291	72,015
Basic earnings per share (in dollars per share)	$ 8.60	$ 6.91	$ 15.09	$ 11.97
Diluted earnings per share (in dollars per share)	$ 8.58	$ 6.90	$ 15.04	$ 11.93
Employee stock options
Effect of dilutive securities:
Effect of dilutive securities (in shares)	4	4	4	4
Restricted stock units
Effect of dilutive securities:
Effect of dilutive securities (in shares)	119	129	223	218