Equity - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jan. 01, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stock repurchase program, authorized amount					$ 2,400,000,000
Repurchases of common stock		$ 148,000,000		$ 1,247,000,000
Stock repurchase program, remaining authorized amount	$ 1,200,000,000		$ 1,200,000,000
Cash dividends per share (in dollars per share)	$ 0.33	$ 0.30	$ 0.99	$ 0.90
Aggregate payout	$ 187,000,000	$ 170,000,000	$ 561,000,000	$ 500,000,000
Open Market, Trading Period
Accumulated Other Comprehensive Income (Loss) [Line Items]
Repurchases of common stock (in shares)				3,200,000
Repurchases of common stock				$ 299,000,000
Rule 10b5-1 Trading Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Repurchases of common stock (in shares)			0	10,400,000
Repurchases of common stock				$ 948,000,000