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Investment Securities (Schedule of Unrealized Loss on Investments) (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months $ 4,071 $ 2,701
Available-for-sale Securities, Unrealized Loss Less than 12 months (106) (42)
Available-for-sale Securities, Fair value 12 months or longer 2,992 4,016
Available-for-sale Securities, Unrealized Loss 12 months or longer (98) (141)
Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months 3,278 2,470
Available-for-sale Securities, Unrealized Loss Less than 12 months (22) (18)
Available-for-sale Securities, Fair value 12 months or longer 2,924 3,976
Available-for-sale Securities, Unrealized Loss 12 months or longer (69) (131)
US Treasury and Government [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months 220 297
Available-for-sale Securities, Unrealized Loss Less than 12 months 0 (3)
Available-for-sale Securities, Fair value 12 months or longer 373 859
Available-for-sale Securities, Unrealized Loss 12 months or longer (1) (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 173 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 9 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 1,731 1,172
Available-for-sale Securities, Unrealized Loss Less than 12 months (11) (10)
Available-for-sale Securities, Fair value 12 months or longer 2,517 3,098
Available-for-sale Securities, Unrealized Loss 12 months or longer (67) (116)
Asset-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months 696 819
Available-for-sale Securities, Unrealized Loss Less than 12 months (2) (3)
Available-for-sale Securities, Fair value 12 months or longer 24 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 449 132
Available-for-sale Securities, Unrealized Loss Less than 12 months (8) (2)
Available-for-sale Securities, Fair value 12 months or longer 10 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 793 231
Available-for-sale Securities, Unrealized Loss Less than 12 months (84) (24)
Available-for-sale Securities, Fair value 12 months or longer 68 40
Available-for-sale Securities, Unrealized Loss 12 months or longer $ (29) $ (10)