Earnings per Share - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ 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 for basic net income per common share	$ 292	$ 433	$ 601	$ 652
Effect of interest on assumed conversions of convertible notes, net of tax	1	2	3	4
Net Income available to common stockholders for dilutive net income per common share	$ 293	$ 435	$ 604	$ 656
Denominator:
Weighted average common shares outstanding for basic net income per common share (in shares)	3,928	4,079	3,938	4,108
Weighted average impact of assumed convertible notes (in shares)	31	30	31	30
Weighted average impact of dilutive equity instruments (in shares)	46	54	47	55
Weighted average shares for diluted net income per common share (in shares)	4,005	4,163	4,016	4,193
Net income per common share:
Basic (in USD per share)	$ 0.07	$ 0.11	$ 0.15	$ 0.16
Diluted (in USD per share)	$ 0.07	$ 0.10	$ 0.15	$ 0.16