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Investment Securities (Schedule of Unrealized Loss on Investments) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months $ 13,051 $ 12,356
Available-for-sale Securities, Unrealized Loss Less than 12 months (311) (317)
Available-for-sale Securities, Fair value 12 months or longer 1,792 2,038
Available-for-sale Securities, Unrealized Loss 12 months or longer (103) (118)
Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months 12,979 12,205
Available-for-sale Securities, Unrealized Loss Less than 12 months (305) (309)
Available-for-sale Securities, Fair value 12 months or longer 1,630 1,769
Available-for-sale Securities, Unrealized Loss 12 months or longer (63) (72)
US Treasury and Government [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months 2,070 1,612
Available-for-sale Securities, Unrealized Loss Less than 12 months (52) (60)
Available-for-sale Securities, Fair value 12 months or longer 0 0
Available-for-sale Securities, Unrealized Loss 12 months or longer 0 0
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 435 524
Available-for-sale Securities, Unrealized Loss Less than 12 months (16) (19)
Available-for-sale Securities, Fair value 12 months or longer 26 0
Available-for-sale Securities, Unrealized Loss 12 months or longer (1) 0
Foreign Government Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months 13 38
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 8,874 8,052
Available-for-sale Securities, Unrealized Loss Less than 12 months (209) (196)
Available-for-sale Securities, Fair value 12 months or longer 531 587
Available-for-sale Securities, Unrealized Loss 12 months or longer (14) (16)
Residential Mortgage Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months 768 813
Available-for-sale Securities, Unrealized Loss Less than 12 months (16) (17)
Available-for-sale Securities, Fair value 12 months or longer 816 860
Available-for-sale Securities, Unrealized Loss 12 months or longer (45) (53)
Commercial Mortgage Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months 79 47
Available-for-sale Securities, Unrealized Loss Less than 12 months (1) (1)
Available-for-sale Securities, Fair value 12 months or longer 77 149
Available-for-sale Securities, Unrealized Loss 12 months or longer 0 (1)
Asset-backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months 175 375
Available-for-sale Securities, Unrealized Loss Less than 12 months 0 (2)
Available-for-sale Securities, Fair value 12 months or longer 134 127
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 565 744
Available-for-sale Securities, Unrealized Loss Less than 12 months (11) (14)
Available-for-sale Securities, Fair value 12 months or longer 46 46
Available-for-sale Securities, Unrealized Loss 12 months or longer (2) (2)
Equity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months 72 151
Available-for-sale Securities, Unrealized Loss Less than 12 months (6) (8)
Available-for-sale Securities, Fair value 12 months or longer 162 269
Available-for-sale Securities, Unrealized Loss 12 months or longer $ (40) $ (46)