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Investment Securities - Investment Securities Available-for-Sale (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost $ 68,717 $ 66,985
Available-for-sale securities, Unrealized Gains 308 334
Available-for-sale securities, Unrealized Losses Other-than-Temporary   (6)
Available-for-sale securities, Unrealized Losses Other (888) (1,029)
Available-for-sale securities, Fair Value [1] 68,137 66,284
U.S. Treasury and Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 23,586 17,314
Available-for-sale securities, Unrealized Gains 3 11
Available-for-sale securities, Unrealized Losses Other (288) (198)
Available-for-sale securities, Fair Value 23,301 17,127
Mortgage-Backed Securities Residential [Member] | Agency [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 38,450 43,558
Available-for-sale securities, Unrealized Gains 152 225
Available-for-sale securities, Unrealized Losses Other (571) (645)
Available-for-sale securities, Fair Value 38,031 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 6 15
Available-for-sale securities, Fair Value 6 15
Asset-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 413  
Available-for-sale securities, Fair Value 419  
Asset-Backed Securities [Member] | Asset-Backed Securities Other [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 413 475
Available-for-sale securities, Unrealized Gains 6 8
Available-for-sale securities, Fair Value 419 483
Obligations of State and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 6,240 5,167
Available-for-sale securities, Unrealized Gains 147 55
Available-for-sale securities, Unrealized Losses Other (29) (183)
Available-for-sale securities, Fair Value 6,358 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 22 27
Available-for-sale securities, Unrealized Gains   9
Available-for-sale securities, Fair Value $ 22 $ 36
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.