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Investment Securities - Investment Securities Available For Sale (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost $ 39,040 $ 51,356
Available-for-sale securities, Unrealized Gains 1,246 1,272
Available-for-sale securities, Unrealized Losses Other-than-Temporary (36) (318)
Available-for-sale securities, Unrealized Losses Other (111) (373)
Available-for-sale securities, Fair Value 40,139 [1] 51,937 [1]
U.S. Treasury and Agencies [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 1,211 1,045
Available-for-sale securities, Unrealized Gains 16 13
Available-for-sale securities, Unrealized Losses Other (1) (1)
Available-for-sale securities, Fair Value 1,226 1,057
Collateralized debt/loan obligation asset-backed securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 32 180
Available-for-sale securities, Unrealized Gains 10 31
Available-for-sale securities, Unrealized Losses Other-than-Temporary   (3)
Available-for-sale securities, Unrealized Losses Other   (2)
Available-for-sale securities, Fair Value 42 206
Asset Backed Securities Other [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 579 694
Available-for-sale securities, Unrealized Gains 14 16
Available-for-sale securities, Unrealized Losses Other-than-Temporary   (5)
Available-for-sale securities, Unrealized Losses Other (1) (24)
Available-for-sale securities, Fair Value 592 681
Obligations of state and political subdivisions [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 6,059 6,394
Available-for-sale securities, Unrealized Gains 396 167
Available-for-sale securities, Unrealized Losses Other   (22)
Available-for-sale securities, Fair Value 6,455 6,539
Obligations of foreign governments [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 6 6
Available-for-sale securities, Fair Value 6 6
Corporate debt securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 814 1,000
Available-for-sale securities, Unrealized Gains 2 1
Available-for-sale securities, Unrealized Losses Other (85) (174)
Available-for-sale securities, Fair Value 731 827
Perpetual preferred securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 205 379
Available-for-sale securities, Unrealized Gains 27 25
Available-for-sale securities, Unrealized Losses Other (14) (86)
Available-for-sale securities, Fair Value 218 318
Other Investment [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 182 188
Available-for-sale securities, Unrealized Gains 20 15
Available-for-sale securities, Unrealized Losses Other   (1)
Available-for-sale securities, Fair Value 202 202
Residential Agency [Member] | Residential [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 28,754 39,337
Available-for-sale securities, Unrealized Gains 746 981
Available-for-sale securities, Unrealized Losses Other (5) (4)
Available-for-sale securities, Fair Value 29,495 40,314
Residential Non-agency Prime [Member] | Residential [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 641 911
Available-for-sale securities, Unrealized Gains 3 5
Available-for-sale securities, Unrealized Losses Other-than-Temporary (16) (63)
Available-for-sale securities, Unrealized Losses Other (4) (50)
Available-for-sale securities, Fair Value 624 803
Residential Non-agency Non-prime [Member] | Residential [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 372 1,047
Available-for-sale securities, Unrealized Gains 4 9
Available-for-sale securities, Unrealized Losses Other-than-Temporary (20) (247)
Available-for-sale securities, Unrealized Losses Other (1) (7)
Available-for-sale securities, Fair Value 355 802
Commercial Agency [Member] | Commercial Mortgage-backed securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 185 133
Available-for-sale securities, Unrealized Gains 8 7
Available-for-sale securities, Fair Value 193 140
Non-agency [Member] | Commercial Mortgage-backed securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost   42
Available-for-sale securities, Unrealized Gains   2
Available-for-sale securities, Unrealized Losses Other   (2)
Available-for-sale securities, Fair Value   $ 42
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.