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Securities - Amortized Cost and Fair Value of Securities Available-for-Sale and Held-to-Maturity (Detail) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost, Available-for-sale securities $ 60,666,000,000 $ 51,791,000,000
Unrealized Gain, Available-for-sale securities 2,056,000,000 1,840,000,000
Unrealized Losses, Available-for-sale securities (190,000,000) (350,000,000)
Fair Value, Available-for-sale securities 62,532,000,000 53,281,000,000
Amortized Cost, Held-to-maturity securities 1,741,000,000 2,035,000,000
Unrealized Gain, Held-to-maturity securities 236,000,000 264,000,000
Unrealized Losses, Held-to-maturity securities   (1,000,000)
Fair Value, Held-to-maturity securities 1,977,000,000 2,298,000,000
Foreign debt securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost, Available-for-sale securities 5,488,000,000 6,640,000,000
Unrealized Gain, Available-for-sale securities 17,000,000 27,000,000
Unrealized Losses, Available-for-sale securities (57,000,000) (97,000,000)
Fair Value, Available-for-sale securities 5,448,000,000 6,570,000,000
Equity securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost, Available-for-sale securities 167,000,000 130,000,000
Unrealized Gain, Available-for-sale securities 8,000,000 10,000,000
Fair Value, Available-for-sale securities 175,000,000 140,000,000
Mortgage-backed securities, U.S. Government agency issued or guaranteed [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost, Available-for-sale securities 15,289,000,000 15,357,000,000
Unrealized Gain, Available-for-sale securities 871,000,000 728,000,000
Unrealized Losses, Available-for-sale securities (4,000,000) (3,000,000)
Fair Value, Available-for-sale securities 16,156,000,000 16,082,000,000
Amortized Cost, Held-to-maturity securities 68,000,000 79,000,000
Unrealized Gain, Held-to-maturity securities 13,000,000 13,000,000
Fair Value, Held-to-maturity securities 81,000,000 92,000,000
Mortgage-backed securities, U.S. Government sponsored enterprises [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost, Available-for-sale securities 168,000,000 40,000,000
Unrealized Gain, Available-for-sale securities 2,000,000 1,000,000
Fair Value, Available-for-sale securities 170,000,000 41,000,000
Amortized Cost, Held-to-maturity securities 1,212,000,000 1,421,000,000
Unrealized Gain, Held-to-maturity securities 167,000,000 195,000,000
Fair Value, Held-to-maturity securities 1,379,000,000 1,616,000,000
Collateralized mortgage obligations, U.S. Government agency issued or guaranteed [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost, Available-for-sale securities 3,875,000,000 6,881,000,000
Unrealized Gain, Available-for-sale securities 175,000,000 177,000,000
Unrealized Losses, Available-for-sale securities   (3,000,000)
Fair Value, Available-for-sale securities 4,050,000,000 7,055,000,000
Amortized Cost, Held-to-maturity securities 289,000,000 308,000,000
Unrealized Gain, Held-to-maturity securities 46,000,000 44,000,000
Fair Value, Held-to-maturity securities 335,000,000 352,000,000
Obligations of U.S. states and political subdivisions [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost, Available-for-sale securities 775,000,000 566,000,000
Unrealized Gain, Available-for-sale securities 40,000,000 35,000,000
Unrealized Losses, Available-for-sale securities   (1,000,000)
Fair Value, Available-for-sale securities 815,000,000 600,000,000
Amortized Cost, Held-to-maturity securities 44,000,000 61,000,000
Unrealized Gain, Held-to-maturity securities 3,000,000 3,000,000
Fair Value, Held-to-maturity securities 47,000,000 64,000,000
Residential mortgage backed securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost, Available-for-sale securities 2,000,000 6,000,000
Unrealized Losses, Available-for-sale securities   (1,000,000)
Fair Value, Available-for-sale securities 2,000,000 5,000,000
Amortized Cost, Held-to-maturity securities 128,000,000 166,000,000
Unrealized Gain, Held-to-maturity securities 7,000,000 9,000,000
Unrealized Losses, Held-to-maturity securities   (1,000,000)
Fair Value, Held-to-maturity securities 135,000,000 174,000,000
U.S. Treasury [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost, Available-for-sale securities 30,612,000,000 18,199,000,000
Unrealized Gain, Available-for-sale securities 557,000,000 498,000,000
Unrealized Losses, Available-for-sale securities (30,000,000) (121,000,000)
Fair Value, Available-for-sale securities 31,139,000,000 18,576,000,000
Direct agency obligations, U.S. Government sponsored enterprises [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost, Available-for-sale securities 3,568,000,000 2,501,000,000
Unrealized Gain, Available-for-sale securities 376,000,000 352,000,000
Unrealized Losses, Available-for-sale securities (2,000,000)  
Fair Value, Available-for-sale securities 3,942,000,000 2,853,000,000
Direct agency obligations, U.S. Government agency issued or guaranteed [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost, Available-for-sale securities 1,000,000 2,000,000
Fair Value, Available-for-sale securities 1,000,000 2,000,000
Commercial mortgages backed securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost, Available-for-sale securities 257,000,000 444,000,000
Unrealized Gain, Available-for-sale securities 7,000,000 9,000,000
Unrealized Losses, Available-for-sale securities   (2,000,000)
Fair Value, Available-for-sale securities 264,000,000 451,000,000
Home equity backed securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost, Available-for-sale securities 322,000,000 369,000,000
Unrealized Losses, Available-for-sale securities (80,000,000) (99,000,000)
Fair Value, Available-for-sale securities 242,000,000 270,000,000
Other securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost, Available-for-sale securities 102,000,000 102,000,000
Unrealized Losses, Available-for-sale securities (17,000,000) (22,000,000)
Fair Value, Available-for-sale securities 85,000,000 80,000,000
Corporate and other domestic debt securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost, Available-for-sale securities 40,000,000 541,000,000
Unrealized Gain, Available-for-sale securities 3,000,000 3,000,000
Fair Value, Available-for-sale securities 43,000,000 544,000,000
Student loans backed securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost, Available-for-sale securities   13,000,000
Unrealized Losses, Available-for-sale securities   (1,000,000)
Fair Value, Available-for-sale securities   $ 12,000,000