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Investment Securities - Investment Securities Available-for-Sale (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost $ 66,276 $ 61,817
Available-for-sale securities, Unrealized Gains 1,009 660
Available-for-sale securities, Unrealized Losses Other-than-Temporary (6) (4)
Available-for-sale securities, Unrealized Losses Other (124) (476)
Available-for-sale securities, Fair Value [1] 67,155 61,997
U.S. Treasury and Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 14,454 4,611
Available-for-sale securities, Unrealized Gains 179 12
Available-for-sale securities, Unrealized Losses Other (3) (27)
Available-for-sale securities, Fair Value 14,630 4,596
Mortgage-Backed Securities Residential [Member] | Agency [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 44,904 50,056
Available-for-sale securities, Unrealized Gains 582 384
Available-for-sale securities, Unrealized Losses Other (53) (364)
Available-for-sale securities, Fair Value 45,433 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 257 316
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 259 318
Mortgage-Backed Securities Residential [Member] | Non-Agency Non-Prime [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 191 221
Available-for-sale securities, Unrealized Gains 18 20
Available-for-sale securities, Unrealized Losses Other-than-Temporary (3) (1)
Available-for-sale securities, Fair Value 206 240
Commercial [Member] | Agency [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 16 52
Available-for-sale securities, Fair Value 16 52
Asset-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 527  
Available-for-sale securities, Fair Value 537  
Asset-Backed Securities [Member] | Collateralized Loan Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 11 16
Available-for-sale securities, Unrealized Gains 2 3
Available-for-sale securities, Fair Value 13 19
Asset-Backed Securities [Member] | Asset-Backed Securities Other [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 516 532
Available-for-sale securities, Unrealized Gains 8 9
Available-for-sale securities, Fair Value 524 541
Obligations of State and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 5,232 5,149
Available-for-sale securities, Unrealized Gains 152 169
Available-for-sale securities, Unrealized Losses Other (8) (2)
Available-for-sale securities, Fair Value 5,376 5,316
Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 628 677
Available-for-sale securities, Unrealized Gains 10 3
Available-for-sale securities, Unrealized Losses Other (59) (70)
Available-for-sale securities, Fair Value 579 610
Perpetual Preferred Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 36 153
Available-for-sale securities, Unrealized Gains 17 20
Available-for-sale securities, Unrealized Losses Other   (12)
Available-for-sale securities, Fair Value 53 161
Other Investment [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 31 34
Available-for-sale securities, Unrealized Gains 35 34
Available-for-sale securities, Fair Value $ 66 $ 68
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.