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Investment Securities (Schedule of Unrealized Loss on Investments) (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months $ 12,989 $ 12,356
Available-for-sale Securities, Unrealized Loss Less than 12 months (235) (317)
Available-for-sale Securities, Fair value 12 months or longer 1,542 2,038
Available-for-sale Securities, Unrealized Loss 12 months or longer (88) (118)
Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months 12,849 12,205
Available-for-sale Securities, Unrealized Loss Less than 12 months (226) (309)
Available-for-sale Securities, Fair value 12 months or longer 1,418 1,769
Available-for-sale Securities, Unrealized Loss 12 months or longer (44) (72)
US Treasury and Government [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months 1,829 1,612
Available-for-sale Securities, Unrealized Loss Less than 12 months (39) (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 401 524
Available-for-sale Securities, Unrealized Loss Less than 12 months (10) (19)
Available-for-sale Securities, Fair value 12 months or longer 15 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 26 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 9,293 8,052
Available-for-sale Securities, Unrealized Loss Less than 12 months (162) (196)
Available-for-sale Securities, Fair value 12 months or longer 448 587
Available-for-sale Securities, Unrealized Loss 12 months or longer (10) (16)
Residential Mortgage Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months 410 813
Available-for-sale Securities, Unrealized Loss Less than 12 months (6) (17)
Available-for-sale Securities, Fair value 12 months or longer 763 860
Available-for-sale Securities, Unrealized Loss 12 months or longer (30) (53)
Commercial Mortgage Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Fair value Less than 12 months 102 47
Available-for-sale Securities, Unrealized Loss Less than 12 months (1) (1)
Available-for-sale Securities, Fair value 12 months or longer 49 149
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 293 375
Available-for-sale Securities, Unrealized Loss Less than 12 months (1) (2)
Available-for-sale Securities, Fair value 12 months or longer 107 127
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 495 744
Available-for-sale Securities, Unrealized Loss Less than 12 months (7) (14)
Available-for-sale Securities, Fair value 12 months or longer 36 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 140 151
Available-for-sale Securities, Unrealized Loss Less than 12 months (9) (8)
Available-for-sale Securities, Fair value 12 months or longer 124 269
Available-for-sale Securities, Unrealized Loss 12 months or longer $ (44) $ (46)