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Investment Securities - Investment Securities Available for Sale (Detail) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost $ 56,589 $ 55,432
Available-for-sale securities, Unrealized Gains 858 980
Available-for-sale securities, Unrealized Losses Other-than-Temporary (4) (3)
Available-for-sale securities, Unrealized Losses Other (365) (340)
Available-for-sale securities, Fair Value [1] 57,078 56,069
U.S. Treasury and Agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 2,752 2,622
Available-for-sale securities, Unrealized Gains 23 14
Available-for-sale securities, Unrealized Losses Other-than-Temporary 0 0
Available-for-sale securities, Unrealized Losses Other (11) (4)
Available-for-sale securities, Fair Value 2,764 2,632
Mortgage-Backed Securities Residential [Member] | Agency [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 46,367 44,668
Available-for-sale securities, Unrealized Gains 528 593
Available-for-sale securities, Unrealized Losses Other-than-Temporary 0 0
Available-for-sale securities, Unrealized Losses Other (274) (244)
Available-for-sale securities, Fair Value 46,621 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 359 399
Available-for-sale securities, Unrealized Gains 8 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 363 405
Mortgage-Backed Securities Residential [Member] | Non-Agency Non-Prime [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 243 261
Available-for-sale securities, Unrealized Gains 20 20
Available-for-sale securities, Unrealized Losses Other-than-Temporary (1) (1)
Available-for-sale securities, Unrealized Losses Other 0 0
Available-for-sale securities, Fair Value 262 280
Commercial [Member] | Agency [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 89 112
Available-for-sale securities, Unrealized Gains 2 3
Available-for-sale securities, Unrealized Losses Other-than-Temporary 0 0
Available-for-sale securities, Unrealized Losses Other 0 0
Available-for-sale securities, Fair Value 91 115
Asset-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 614  
Available-for-sale securities, Fair Value 629  
Asset-Backed Securities [Member] | Collateralized Loan Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 18 18
Available-for-sale securities, Unrealized Gains 3 4
Available-for-sale securities, Unrealized Losses Other-than-Temporary 0 0
Available-for-sale securities, Unrealized Losses Other 0 0
Available-for-sale securities, Fair Value 21 22
Asset-Backed Securities [Member] | Asset-Backed Securities Other [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 596 607
Available-for-sale securities, Unrealized Gains 12 13
Available-for-sale securities, Unrealized Losses Other-than-Temporary 0 0
Available-for-sale securities, Unrealized Losses Other 0 (1)
Available-for-sale securities, Fair Value 608 619
Obligations of State and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 5,180 5,604
Available-for-sale securities, Unrealized Gains 203 265
Available-for-sale securities, Unrealized Losses Other-than-Temporary 0 0
Available-for-sale securities, Unrealized Losses Other (9) (1)
Available-for-sale securities, Fair Value 5,374 5,868
Obligations of Foreign Governments [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 0 6
Available-for-sale securities, Unrealized Gains 0 0
Available-for-sale securities, Unrealized Losses Other-than-Temporary 0 0
Available-for-sale securities, Unrealized Losses Other 0 0
Available-for-sale securities, Fair Value 0 6
Corporate Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 691 690
Available-for-sale securities, Unrealized Gains 1 3
Available-for-sale securities, Unrealized Losses Other-than-Temporary 0 0
Available-for-sale securities, Unrealized Losses Other (60) (79)
Available-for-sale securities, Fair Value 632 614
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 28 27
Available-for-sale securities, Unrealized Losses Other-than-Temporary 0 0
Available-for-sale securities, Unrealized Losses Other (10) (10)
Available-for-sale securities, Fair Value 174 217
Other Investment [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 138 245
Available-for-sale securities, Unrealized Gains 30 29
Available-for-sale securities, Unrealized Losses Other-than-Temporary 0  
Available-for-sale securities, Unrealized Losses Other 0 0
Available-for-sale securities, Fair Value $ 168 $ 274
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.