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Investment Securities - Investment Securities Available-for-Sale (Detail) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost $ 59,704 $ 55,432
Available-for-sale securities, Unrealized Gains 910 980
Available-for-sale securities, Unrealized Losses Other-than-Temporary (3) (3)
Available-for-sale securities, Unrealized Losses Other (215) (340)
Available-for-sale securities, Fair Value [1] 60,396 56,069
U.S. Treasury and Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 2,835 2,622
Available-for-sale securities, Unrealized Gains 40 14
Available-for-sale securities, Unrealized Losses Other (1) (4)
Available-for-sale securities, Fair Value 2,874 2,632
Mortgage-Backed Securities Residential [Member] | Agency [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 49,446 44,668
Available-for-sale securities, Unrealized Gains 582 593
Available-for-sale securities, Unrealized Losses Other (133) (244)
Available-for-sale securities, Fair Value 49,895 45,017
Mortgage-Backed Securities Residential [Member] | Non-Agency Prime [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 334 399
Available-for-sale securities, Unrealized Gains 7 9
Available-for-sale securities, Unrealized Losses Other-than-Temporary (2) (2)
Available-for-sale securities, Unrealized Losses Other (1) (1)
Available-for-sale securities, Fair Value 338 405
Mortgage-Backed Securities Residential [Member] | Non-Agency Non-Prime [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 231 261
Available-for-sale securities, Unrealized Gains 21 20
Available-for-sale securities, Unrealized Losses Other-than-Temporary (1) (1)
Available-for-sale securities, Fair Value 251 280
Commercial [Member] | Agency [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 71 112
Available-for-sale securities, Unrealized Gains 1 3
Available-for-sale securities, Fair Value 72 115
Asset-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 605  
Available-for-sale securities, Fair Value 619  
Asset-Backed Securities [Member] | Collateralized Loan Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 17 18
Available-for-sale securities, Unrealized Gains 3 4
Available-for-sale securities, Fair Value 20 22
Asset-Backed Securities [Member] | Asset-Backed Securities Other [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 588 607
Available-for-sale securities, Unrealized Gains 12 13
Available-for-sale securities, Unrealized Losses Other (1) (1)
Available-for-sale securities, Fair Value 599 619
Obligations of State and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 5,121 5,604
Available-for-sale securities, Unrealized Gains 187 265
Available-for-sale securities, Unrealized Losses Other (6) (1)
Available-for-sale securities, Fair Value 5,302 5,868
Obligations of Foreign Governments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost   6
Available-for-sale securities, Fair Value   6
Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 677 690
Available-for-sale securities, Unrealized Gains 1 3
Available-for-sale securities, Unrealized Losses Other (62) (79)
Available-for-sale securities, Fair Value 616 614
Perpetual Preferred Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 156 200
Available-for-sale securities, Unrealized Gains 26 27
Available-for-sale securities, Unrealized Losses Other (11) (10)
Available-for-sale securities, Fair Value 171 217
Other Investment [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 228 245
Available-for-sale securities, Unrealized Gains 30 29
Available-for-sale securities, Fair Value $ 258 $ 274
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.