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Equity Level 4 (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended
Jul. 27, 2016
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Class of Warrant or Right [Line Items]              
Treasury stock acquired   7,800,000 0   16,200,000    
Payments for Repurchase of Common Stock   $ 350 $ 350   $ 700 $ 500  
Accelerated Share Repurchases, Final Price Paid Per Share   $ 44,740,000 $ 41,720,000        
Warrants outstanding   4,200,000     4,200,000   4,400,000
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 9.197     $ 9.197   $ 9.264
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased   630,000,000     630,000,000    
Warrant [Member]              
Class of Warrant or Right [Line Items]              
Warrants Exercised   0   1,000,000 200,000 1,600,000  
Treasury Stock [Member]              
Class of Warrant or Right [Line Items]              
Treasury Stock, Value, Acquired, Cost Method         $ 700 $ 500  
Common Stock [Member]              
Class of Warrant or Right [Line Items]              
Treasury stock acquired         16,222,000,000 12,117,000,000  
Subsequent Event [Member]              
Class of Warrant or Right [Line Items]              
Treasury Stock, Value, Acquired, Cost Method $ 89            
Treasury stock acquired 2,000,000