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Investment Securities (Schedule of Unrealized Loss on Investments) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months $ 8,511 $ 2,701
Available-for-sale Securities, Unrealized Loss Less than 12 months (139) (42)
Available-for-sale Securities, Fair value 12 months or longer 2,798 4,016
Available-for-sale Securities, Unrealized Loss 12 months or longer (150) (141)
Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months 7,977 2,470
Available-for-sale Securities, Unrealized Loss Less than 12 months (85) (18)
Available-for-sale Securities, Fair value 12 months or longer 2,702 3,976
Available-for-sale Securities, Unrealized Loss 12 months or longer (110) (131)
US Treasury and Government [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months 1,553 297
Available-for-sale Securities, Unrealized Loss Less than 12 months (17) (3)
Available-for-sale Securities, Fair value 12 months or longer 173 859
Available-for-sale Securities, Unrealized Loss 12 months or longer (2) (15)
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 179 50
Available-for-sale Securities, Unrealized Loss Less than 12 months (1) 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
Foreign Government Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months 2 0
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 4,096 1,172
Available-for-sale Securities, Unrealized Loss Less than 12 months (43) (10)
Available-for-sale Securities, Fair value 12 months or longer 2,453 3,098
Available-for-sale Securities, Unrealized Loss 12 months or longer (107) (116)
Asset-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months 1,402 819
Available-for-sale Securities, Unrealized Loss Less than 12 months (8) (3)
Available-for-sale Securities, Fair value 12 months or longer 64 8
Available-for-sale Securities, Unrealized Loss 12 months or longer 0 0
Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months 745 132
Available-for-sale Securities, Unrealized Loss Less than 12 months (16) (2)
Available-for-sale Securities, Fair value 12 months or longer 12 11
Available-for-sale Securities, Unrealized Loss 12 months or longer (1) 0
Equity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months 534 231
Available-for-sale Securities, Unrealized Loss Less than 12 months (54) (24)
Available-for-sale Securities, Fair value 12 months or longer 96 40
Available-for-sale Securities, Unrealized Loss 12 months or longer $ (40) $ (10)