Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Numerator:
Net income available to common stockholders	$ 703	$ 606	$ 1,745	$ 1,466
Denominator:
Denominator for basic earnings per share—weighted-average common shares (in shares)	68,153	69,854	68,757	71,140
Effect of dilutive securities:
Denominator for diluted earnings per share—adjusted weighted-average common shares (in shares)	68,263	70,053	68,942	71,337
Basic earnings per share (in dollars per share)	$ 10.30	$ 8.69	$ 25.37	$ 20.61
Diluted earnings per share (in dollars per share)	$ 10.29	$ 8.66	$ 25.30	$ 20.56
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)	106	195	181	193