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Investment Securities (Schedule of Unrealized Loss on Investments) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months $ 12,356 $ 8,511
Available-for-sale Securities, Unrealized Loss Less than 12 months (317) (139)
Available-for-sale Securities, Fair value 12 months or longer 2,038 2,798
Available-for-sale Securities, Unrealized Loss 12 months or longer (118) (150)
Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months 12,205 7,977
Available-for-sale Securities, Unrealized Loss Less than 12 months (309) (85)
Available-for-sale Securities, Fair value 12 months or longer 1,769 2,702
Available-for-sale Securities, Unrealized Loss 12 months or longer (72) (110)
US Treasury and Government [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months 1,612 1,553
Available-for-sale Securities, Unrealized Loss Less than 12 months (60) (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 524 179
Available-for-sale Securities, Unrealized Loss Less than 12 months (19) (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 38 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
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months 8,052 2,524
Available-for-sale Securities, Unrealized Loss Less than 12 months (196) (21)
Available-for-sale Securities, Fair value 12 months or longer 587 1,132
Available-for-sale Securities, Unrealized Loss 12 months or longer (16) (34)
Residential Mortgage Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months 813 1,231
Available-for-sale Securities, Unrealized Loss Less than 12 months (17) (19)
Available-for-sale Securities, Fair value 12 months or longer 860 1,180
Available-for-sale Securities, Unrealized Loss 12 months or longer (53) (71)
Commercial Mortgage Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months 47 341
Available-for-sale Securities, Unrealized Loss Less than 12 months (1) (3)
Available-for-sale Securities, Fair value 12 months or longer 149 141
Available-for-sale Securities, Unrealized Loss 12 months or longer (1) (2)
Asset-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months 375 1,402
Available-for-sale Securities, Unrealized Loss Less than 12 months (2) (8)
Available-for-sale Securities, Fair value 12 months or longer 127 64
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 744 745
Available-for-sale Securities, Unrealized Loss Less than 12 months (14) (16)
Available-for-sale Securities, Fair value 12 months or longer 46 12
Available-for-sale Securities, Unrealized Loss 12 months or longer (2) (1)
Equity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months 151 534
Available-for-sale Securities, Unrealized Loss Less than 12 months (8) (54)
Available-for-sale Securities, Fair value 12 months or longer 269 96
Available-for-sale Securities, Unrealized Loss 12 months or longer $ (46) $ (40)