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Equity - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jan. 01, 2019
Class of Stock [Line Items]
Stock repurchase program, authorized amount					$ 2,000,000,000.0
Repurchases of common stock	$ 340,000,000	$ 300,000,000	$ 1,120,000,000	$ 1,059,000,000
Stock repurchase program, remaining authorized amount	$ 880,000,000		$ 880,000,000
Cash dividends per share (in dollars per share)	$ 0.275	$ 0.24	$ 0.825	$ 0.72
Aggregate payout	$ 155,000,000	$ 138,000,000	$ 467,000,000	$ 417,000,000
Rule 10b5-1 Trading Plan
Class of Stock [Line Items]
Repurchases of common stock (in shares)			12.5
Repurchases of common stock			$ 1,000,000,000.0
Open Market
Class of Stock [Line Items]
Repurchases of common stock (in shares)			1.3
Repurchases of common stock			$ 100,000,000

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