Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator:
Net income available to common stockholders	$ 493	$ 293	$ 860	$ 496
Denominator:
Denominator for basic earnings per share—weighted-average common shares (in shares)	71,221	72,455	71,793	72,397
Effect of dilutive securities:
Denominator for diluted earnings per share—adjusted weighted-average common shares (in shares)	71,354	72,717	72,015	72,693
Basic earnings per share (in dollars per share)	$ 6.91	$ 4.03	$ 11.97	$ 6.85
Diluted earnings per share (in dollars per share)	$ 6.90	$ 4.02	$ 11.93	$ 6.82
Employee stock options
Effect of dilutive securities:
Effect of dilutive securities (in shares)	4	4	4	5
Restricted stock units
Effect of dilutive securities:
Effect of dilutive securities (in shares)	129	258	218	291