Equity - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jan. 01, 2020
Class of Stock [Line Items]
Stock repurchase program, authorized amount					$ 2,400,000,000
Repurchases of common stock	$ 148,000,000	$ 340,000,000	$ 1,247,000,000	$ 1,120,000,000
Stock repurchase program, remaining authorized amount	$ 1,200,000,000		$ 1,200,000,000
Cash dividends per share (in dollars per share)	$ 0.30	$ 0.275	$ 0.90	$ 0.825
Aggregate payout	$ 170,000,000	$ 155,000,000	$ 500,000,000	$ 467,000,000
Rule 10b5-1 Trading Plan
Class of Stock [Line Items]
Repurchases of common stock (in shares)			10.4
Repurchases of common stock			$ 948,000,000
Open Market
Class of Stock [Line Items]
Repurchases of common stock (in shares)			3.2
Repurchases of common stock			$ 299,000,000