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Equity (Narrative) (Details) - USD ($)
 12 Months Ended 54 Months Ended
Feb. 08, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Class of Stock [Line Items]          
Preferred stock authorized, shares (in shares)   500,000,000     500,000,000
Par value of preferred stock, per share (in dollars per share)   $ 0.01     $ 0.01
Preferred stock outstanding, shares (in shares)   0 0   0
Repurchase of common stock, shares (in shares)       17,422,615  
Cost of shares repurchased   $ 1,042,000,000 $ 1,512,000,000 $ 2,282,000,000  
Share Repurchase Program And Additional Share Repurchases          
Class of Stock [Line Items]          
Amount authorized for stock repurchase   $ 9,000,000,000     $ 9,000,000,000
Repurchase of common stock, shares (in shares)         105,404,649
Cost of shares repurchased         $ 7,400,000,000
Subsequent Event          
Class of Stock [Line Items]          
Quarterly cash dividend declared (in dollars per share) $ 0.63        
Share exchange—PSPI transaction          
Class of Stock [Line Items]          
Repurchase of common stock, shares (in shares)       17,423,000  
Cost of shares repurchased       $ 1,350,000,000