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Investment Securities - Investment Securities Available-for-Sale (Detail) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost $ 68,041 $ 66,985
Available-for-sale securities, Unrealized Gains 327 334
Available-for-sale securities, Unrealized Losses Other-than-Temporary   (6)
Available-for-sale securities, Unrealized Losses Other (596) (1,029)
Available-for-sale securities, Fair Value [1] 67,772 66,284
U.S. Treasury and Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 22,163 17,314
Available-for-sale securities, Unrealized Gains 25 11
Available-for-sale securities, Unrealized Losses Other (120) (198)
Available-for-sale securities, Fair Value 22,068 17,127
Mortgage-Backed Securities Residential [Member] | Agency [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 39,744 43,558
Available-for-sale securities, Unrealized Gains 197 225
Available-for-sale securities, Unrealized Losses Other (388) (645)
Available-for-sale securities, Fair Value 39,553 43,138
Mortgage-Backed Securities Residential [Member] | Non-Agency Prime [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost   240
Available-for-sale securities, Unrealized Gains   6
Available-for-sale securities, Unrealized Losses Other-than-Temporary   (3)
Available-for-sale securities, Unrealized Losses Other   (1)
Available-for-sale securities, Fair Value   242
Mortgage-Backed Securities Residential [Member] | Non-Agency Non-Prime [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost   178
Available-for-sale securities, Unrealized Gains   20
Available-for-sale securities, Unrealized Losses Other-than-Temporary   (3)
Available-for-sale securities, Fair Value   195
Commercial [Member] | Agency [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 8 15
Available-for-sale securities, Fair Value 8 15
Asset-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 418  
Available-for-sale securities, Fair Value 425  
Asset-Backed Securities [Member] | Asset-Backed Securities Other [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 418 475
Available-for-sale securities, Unrealized Gains 7 8
Available-for-sale securities, Fair Value 425 483
Obligations of State and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 5,681 5,167
Available-for-sale securities, Unrealized Gains 88 55
Available-for-sale securities, Unrealized Losses Other (88) (183)
Available-for-sale securities, Fair Value 5,681 5,039
Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost   11
Available-for-sale securities, Unrealized Losses Other   (2)
Available-for-sale securities, Fair Value   9
Other Investment [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 27 27
Available-for-sale securities, Unrealized Gains 10 9
Available-for-sale securities, Fair Value $ 37 $ 36
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.