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Investment Securities - Investment Securities Available-for-Sale (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost $ 66,985 $ 61,817
Available-for-sale securities, Unrealized Gains 334 660
Available-for-sale securities, Unrealized Losses Other-than-Temporary (6) (4)
Available-for-sale securities, Unrealized Losses Other (1,029) (476)
Available-for-sale securities, Fair Value [1] 66,284 61,997
U.S. Treasury and Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 17,314 4,611
Available-for-sale securities, Unrealized Gains 11 12
Available-for-sale securities, Unrealized Losses Other (198) (27)
Available-for-sale securities, Fair Value 17,127 4,596
Mortgage-Backed Securities Residential [Member] | Agency [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 43,558 50,056
Available-for-sale securities, Unrealized Gains 225 384
Available-for-sale securities, Unrealized Losses Other (645) (364)
Available-for-sale securities, Fair Value 43,138 50,076
Mortgage-Backed Securities Residential [Member] | Non-Agency Prime [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 240 316
Available-for-sale securities, Unrealized Gains 6 6
Available-for-sale securities, Unrealized Losses Other-than-Temporary (3) (3)
Available-for-sale securities, Unrealized Losses Other (1) (1)
Available-for-sale securities, Fair Value 242 318
Mortgage-Backed Securities Residential [Member] | Non-Agency Non-Prime [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 178 221
Available-for-sale securities, Unrealized Gains 20 20
Available-for-sale securities, Unrealized Losses Other-than-Temporary (3) (1)
Available-for-sale securities, Fair Value 195 240
Commercial [Member] | Agency [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 15 52
Available-for-sale securities, Fair Value 15 52
Asset-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 475  
Available-for-sale securities, Fair Value 483  
Asset-Backed Securities [Member] | Collateralized Loan Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost   16
Available-for-sale securities, Unrealized Gains   3
Available-for-sale securities, Fair Value   19
Asset-Backed Securities [Member] | Asset-Backed Securities Other [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 475 532
Available-for-sale securities, Unrealized Gains 8 9
Available-for-sale securities, Fair Value 483 541
Obligations of State and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 5,167 5,149
Available-for-sale securities, Unrealized Gains 55 169
Available-for-sale securities, Unrealized Losses Other (183) (2)
Available-for-sale securities, Fair Value 5,039 5,316
Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 11 677
Available-for-sale securities, Unrealized Gains   3
Available-for-sale securities, Unrealized Losses Other (2) (70)
Available-for-sale securities, Fair Value 9 610
Perpetual Preferred Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost   153
Available-for-sale securities, Unrealized Gains   20
Available-for-sale securities, Unrealized Losses Other   (12)
Available-for-sale securities, Fair Value   161
Other Investment [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 27 34
Available-for-sale securities, Unrealized Gains 9 34
Available-for-sale securities, Fair Value $ 36 $ 68
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.