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Equity Level 4 (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Jul. 22, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Sep. 30, 2015
Dec. 31, 2014
Class of Warrant or Right [Line Items]              
Treasury stock acquired   6,000   12,100      
Payments for Repurchase of Common Stock   $ 250   $ 500 $ 651    
Warrants outstanding   5,700   5,700     7,200
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 9.329   $ 9.329     $ 9.388
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased   479,000   479,000      
Warrant [Member]              
Class of Warrant or Right [Line Items]              
Warrants Exercised   1,000 11,000 1,600 20,800    
Treasury Stock [Member]              
Class of Warrant or Right [Line Items]              
Treasury Stock, Value, Acquired, Cost Method       $ 500 $ 651    
Common Stock [Member]              
Class of Warrant or Right [Line Items]              
Treasury stock acquired       12,117 18,968    
Subsequent Event [Member]              
Class of Warrant or Right [Line Items]              
Stock Repurchase Program, Authorized Amount           $ 4,375  
Treasury Stock, Value, Acquired, Cost Method $ 71            
Treasury stock acquired 1,600            
Stock Repurchase Program, Increase in Number of Shares Authorized to be Repurchased           $ 1,600