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Common Stock (Details) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
May. 31, 2015
Equity, Class of Treasury Stock [Line Items]      
Payments for repurchase of common stock $ 200,000,000 $ 300,000,000  
Common Stock      
Equity, Class of Treasury Stock [Line Items]      
Common stock repurchased (in shares) 3,500,000.0 5,300,000  
Share repurchases program, authorized amount (up to)     $ 2,000,000,000
Stock repurchase program, remaining authorized repurchase amount $ 960,000,000