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Investment Securities (Schedule of Unrealized Loss on Investments) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months $ 3,550 $ 8,511
Available-for-sale Securities, Unrealized Loss Less than 12 months (72) (139)
Available-for-sale Securities, Fair value 12 months or longer 2,728 2,798
Available-for-sale Securities, Unrealized Loss 12 months or longer (105) (150)
Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months 3,214 7,977
Available-for-sale Securities, Unrealized Loss Less than 12 months (33) (85)
Available-for-sale Securities, Fair value 12 months or longer 2,580 2,702
Available-for-sale Securities, Unrealized Loss 12 months or longer (58) (110)
US Treasury and Government [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months 0 1,553
Available-for-sale Securities, Unrealized Loss Less than 12 months 0 (17)
Available-for-sale Securities, Fair value 12 months or longer 0 173
Available-for-sale Securities, Unrealized Loss 12 months or longer 0 (2)
US States and Political Subdivisions Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months 248 179
Available-for-sale Securities, Unrealized Loss Less than 12 months (1) (1)
Available-for-sale Securities, Fair value 12 months or longer 0 0
Available-for-sale Securities, Unrealized Loss 12 months or longer 0 0
Foreign Government Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months 0 2
Available-for-sale Securities, Unrealized Loss Less than 12 months 0 0
Available-for-sale Securities, Fair value 12 months or longer 0 0
Available-for-sale Securities, Unrealized Loss 12 months or longer 0 0
Residential Mortgage Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months 1,336 4,096
Available-for-sale Securities, Unrealized Loss Less than 12 months (16) (43)
Available-for-sale Securities, Fair value 12 months or longer 2,448 2,453
Available-for-sale Securities, Unrealized Loss 12 months or longer (56) (107)
Asset-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months 1,339 1,402
Available-for-sale Securities, Unrealized Loss Less than 12 months (10) (8)
Available-for-sale Securities, Fair value 12 months or longer 118 64
Available-for-sale Securities, Unrealized Loss 12 months or longer (1) 0
Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months 291 745
Available-for-sale Securities, Unrealized Loss Less than 12 months (6) (16)
Available-for-sale Securities, Fair value 12 months or longer 14 12
Available-for-sale Securities, Unrealized Loss 12 months or longer (1) (1)
Equity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months 336 534
Available-for-sale Securities, Unrealized Loss Less than 12 months (39) (54)
Available-for-sale Securities, Fair value 12 months or longer 148 96
Available-for-sale Securities, Unrealized Loss 12 months or longer $ (47) $ (40)