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Investment Securities (Gross Unrealized Loss and Fair Value of Securities Available for Sale) (Details) (USD $)
In Millions
Sep. 30, 2011
Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]  
Unrealized loss position less than 12 months - unrealized loss$ (140)$ (500)
Unrealized loss position 12 months or more - unrealized loss(1,398)(1,476)
Total unrealized loss(1,538)(1,976)
Debt Securities [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Unrealized loss position less than 12 months - fair value7,00820,384
Unrealized loss position 12 months or more - fair value6,5247,013
Total fair value13,53227,397
Debt Securities [Member] | US Treasury and Government Agencies Securities [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Unrealized loss position less than 12 months - unrealized loss (22)
Unrealized loss position less than 12 months - fair value 398
Total unrealized loss (22)
Total fair value 398
Debt Securities [Member] | Residential Mortgage-backed Securities [Member] | Mortgage-backed Securities Agency [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Unrealized loss position less than 12 months - unrealized loss(45)(406)
Unrealized loss position less than 12 months - fair value3,22317,040
Unrealized loss position 12 months or more - unrealized loss(34)(14)
Unrealized loss position 12 months or more - fair value828186
Total unrealized loss(79)(420)
Total fair value4,05117,226
Debt Securities [Member] | Residential Mortgage-backed Securities [Member] | Mortgage-backed Securities Non-agency [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Unrealized loss position less than 12 months - unrealized loss(21)(17)
Unrealized loss position less than 12 months - fair value372345
Unrealized loss position 12 months or more - unrealized loss(1,127)(1,173)
Unrealized loss position 12 months or more - fair value4,6455,707
Total unrealized loss(1,148)(1,190)
Total fair value5,0176,052
Debt Securities [Member] | Commercial Mortgage Backed Securities [Member] | Mortgage-backed Securities Agency [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Unrealized loss position less than 12 months - unrealized loss (6)
Unrealized loss position less than 12 months - fair value 344
Total unrealized loss (6)
Total fair value 344
Debt Securities [Member] | Commercial Mortgage Backed Securities [Member] | Mortgage-backed Securities Non-agency [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Unrealized loss position less than 12 months - unrealized loss(53)(8)
Unrealized loss position less than 12 months - fair value1,134184
Unrealized loss position 12 months or more - unrealized loss (3)
Unrealized loss position 12 months or more - fair value 84
Total unrealized loss(53)(11)
Total fair value1,134268
Debt Securities [Member] | Asset backed [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Unrealized loss position less than 12 months - unrealized loss(7)(5)
Unrealized loss position less than 12 months - fair value1,372441
Unrealized loss position 12 months or more - unrealized loss(188)(233)
Unrealized loss position 12 months or more - fair value757776
Total unrealized loss(195)(238)
Total fair value2,1291,217
Debt Securities [Member] | State and Municipal [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Unrealized loss position less than 12 months - unrealized loss(5)(22)
Unrealized loss position less than 12 months - fair value347931
Unrealized loss position 12 months or more - unrealized loss(46)(50)
Unrealized loss position 12 months or more - fair value257247
Total unrealized loss(51)(72)
Total fair value6041,178
Debt Securities [Member] | Other Debt Securities [Member]
  
Schedule of Available-for-sale Securities [Line Items]  
Unrealized loss position less than 12 months - unrealized loss(9)(14)
Unrealized loss position less than 12 months - fair value560701
Unrealized loss position 12 months or more - unrealized loss(3)(3)
Unrealized loss position 12 months or more - fair value3713
Total unrealized loss(12)(17)
Total fair value$ 597$ 714