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Investment Securities - Investment Securities Available-for-Sale (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost $ 61,817 $ 55,432
Available-for-sale securities, Unrealized Gains 660 980
Available-for-sale securities, Unrealized Losses Other-than-Temporary (4) (3)
Available-for-sale securities, Unrealized Losses Other (476) (340)
Available-for-sale securities, Fair Value [1] 61,997 56,069
U.S. Treasury and Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 4,611 2,622
Available-for-sale securities, Unrealized Gains 12 14
Available-for-sale securities, Unrealized Losses Other (27) (4)
Available-for-sale securities, Fair Value 4,596 2,632
Mortgage-Backed Securities Residential [Member] | Agency [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 50,056 44,668
Available-for-sale securities, Unrealized Gains 384 593
Available-for-sale securities, Unrealized Losses Other (364) (244)
Available-for-sale securities, Fair Value 50,076 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 316 399
Available-for-sale securities, Unrealized Gains 6 9
Available-for-sale securities, Unrealized Losses Other-than-Temporary (3) (2)
Available-for-sale securities, Unrealized Losses Other (1) (1)
Available-for-sale securities, Fair Value 318 405
Mortgage-Backed Securities Residential [Member] | Non-Agency Non-Prime [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 221 261
Available-for-sale securities, Unrealized Gains 20 20
Available-for-sale securities, Unrealized Losses Other-than-Temporary (1) (1)
Available-for-sale securities, Fair Value 240 280
Commercial [Member] | Agency [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 52 112
Available-for-sale securities, Unrealized Gains   3
Available-for-sale securities, Fair Value 52 115
Asset-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 548  
Available-for-sale securities, Fair Value 560  
Asset-Backed Securities [Member] | Collateralized Loan Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 16 18
Available-for-sale securities, Unrealized Gains 3 4
Available-for-sale securities, Fair Value 19 22
Asset-Backed Securities [Member] | Asset-Backed Securities Other [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 532 607
Available-for-sale securities, Unrealized Gains 9 13
Available-for-sale securities, Unrealized Losses Other   (1)
Available-for-sale securities, Fair Value 541 619
Obligations of State and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 5,149 5,604
Available-for-sale securities, Unrealized Gains 169 265
Available-for-sale securities, Unrealized Losses Other (2) (1)
Available-for-sale securities, Fair Value 5,316 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 3 3
Available-for-sale securities, Unrealized Losses Other (70) (79)
Available-for-sale securities, Fair Value 610 614
Perpetual Preferred Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 153 200
Available-for-sale securities, Unrealized Gains 20 27
Available-for-sale securities, Unrealized Losses Other (12) (10)
Available-for-sale securities, Fair Value 161 217
Other Investment [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 34 245
Available-for-sale securities, Unrealized Gains 34 29
Available-for-sale securities, Fair Value $ 68 $ 274
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.