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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