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Investment Securities - Investment Securities Available for Sale (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost $ 39,590 $ 39,040
Available-for-sale securities, Unrealized Gains 1,136 1,246
Available-for-sale securities, Unrealized Losses Other-than-Temporary (18) (36)
Available-for-sale securities, Unrealized Losses Other (138) (111)
Available-for-sale securities, Fair Value 40,570 [1] 40,139 [1]
U.S. Treasury and Agencies [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 1,493 1,211
Available-for-sale securities, Unrealized Gains 14 16
Available-for-sale securities, Unrealized Losses Other (1) (1)
Available-for-sale securities, Fair Value 1,506 1,226
Collateralized debt/loan obligation asset-backed securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 20 32
Available-for-sale securities, Unrealized Gains 6 10
Available-for-sale securities, Fair Value 26 42
Asset Backed Securities Other [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 600 579
Available-for-sale securities, Unrealized Gains 14 14
Available-for-sale securities, Unrealized Losses Other (1) (1)
Available-for-sale securities, Fair Value 613 592
Obligations of State and Political Subdivisions [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 5,927 6,059
Available-for-sale securities, Unrealized Gains 357 396
Available-for-sale securities, Unrealized Losses Other (4)  
Available-for-sale securities, Fair Value 6,280 6,455
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 814 814
Available-for-sale securities, Unrealized Gains 3 2
Available-for-sale securities, Unrealized Losses Other (77) (85)
Available-for-sale securities, Fair Value 740 731
Perpetual preferred securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 205 205
Available-for-sale securities, Unrealized Gains 32 27
Available-for-sale securities, Unrealized Losses Other (12) (14)
Available-for-sale securities, Fair Value 225 218
Other Investment [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 554 182
Available-for-sale securities, Unrealized Gains 23 20
Available-for-sale securities, Fair Value 577 202
Residential Agency [Member] | Residential [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 28,833 28,754
Available-for-sale securities, Unrealized Gains 668 746
Available-for-sale securities, Unrealized Losses Other (40) (5)
Available-for-sale securities, Fair Value 29,461 29,495
Residential Non-agency Prime [Member] | Residential [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 605 641
Available-for-sale securities, Unrealized Gains 6 3
Available-for-sale securities, Unrealized Losses Other-than-Temporary (9) (16)
Available-for-sale securities, Unrealized Losses Other (3) (4)
Available-for-sale securities, Fair Value 599 624
Residential Non-agency Non-prime [Member] | Residential [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 353 372
Available-for-sale securities, Unrealized Gains 6 4
Available-for-sale securities, Unrealized Losses Other-than-Temporary (9) (20)
Available-for-sale securities, Unrealized Losses Other   (1)
Available-for-sale securities, Fair Value 350 355
Commercial Agency [Member] | Commercial Mortgage-backed securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale securities, Amortized Cost 180 185
Available-for-sale securities, Unrealized Gains 7 8
Available-for-sale securities, Fair Value $ 187 $ 193
[1] Includes only collateral pledged by the Company where counterparties have the right to sell or pledge the collateral.