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Equity Level 4 (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Oct. 24, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Class of Warrant or Right [Line Items]                
Warrants outstanding   2.3       2.3   4.0
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 9.030       $ 9.030   $ 9.126
Stock Repurchase Program, Authorized Amount   $ 1,300       $ 1,300    
Treasury stock acquired   6.0 6.6 6.7   19.3    
Treasury Stock, Value, Acquired, Cost Method   $ 325 $ 325 $ 325   $ 975    
Treasury Stock Acquired, Average Cost Per Share   $ 54,350,000 $ 49,340,000 $ 48,470,000        
Stock Repurchase Program, Remaining Authorized Repurchase Amount   $ 325 $ 650 $ 975   $ 325    
Subsequent Event [Member]                
Class of Warrant or Right [Line Items]                
Treasury stock acquired 0.9              
Treasury Stock, Value, Acquired, Cost Method $ 52              
Warrant [Member]                
Class of Warrant or Right [Line Items]                
Warrants Exercised   0.6     0.1 1.7 0.3