v2.4.0.8
Securitizations and Variable Interest Entities Textual (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Securitizations and Variable Interest Entities (Textual) [Abstract]          
Short-term borrowings, Amount $ 56,983,000,000   $ 56,983,000,000   $ 57,175,000,000
Accrued expenses and other liabilities 74,843,000,000   74,843,000,000   76,668,000,000
Long-term Debt 123,375,000,000   123,375,000,000   127,379,000,000
% of underlying collateral rated as investment grade 75.00%   75.00%   83.00%
Net Gains from Sale of Assets Securitizations 46,000,000 53,000,000 110,000,000 64,000,000  
Amount of servicing asset at fair value 14,185,000,000   14,185,000,000   11,538,000,000
Amount of servicing asset at amortized cost 1,176,000,000   1,176,000,000   1,160,000,000
Total Loans 1,414,424,000,000   1,414,424,000,000   1,414,103,000,000
Delinquent loans 29,646,000,000   29,646,000,000   33,900,000,000
VIEs that we consolidate, recourse [Member]
          
Securitizations and Variable Interest Entities (Textual) [Abstract]          
Short-term borrowings, Amount 0   0   2,100,000,000
Accrued expenses and other liabilities 876,000,000   876,000,000   767,000,000
Long-term Debt 29,000,000   29,000,000   29,000,000
FNMA, FHLMC and GNMA [Member]
          
Securitizations and Variable Interest Entities (Textual) [Abstract]          
Total Loans 1,300,000,000,000   1,300,000,000,000   1,300,000,000,000
Delinquent loans 16,400,000,000   16,400,000,000   17,400,000,000
Residential Mortgage [Member]
          
Securitizations and Variable Interest Entities (Textual) [Abstract]          
Amount transferred related to mortgages to unconsolidated VIE 111,200,000,000 129,700,000,000 211,900,000,000 269,100,000,000  
Gain Loss on Transfer of Unconsolidated VIE Debt Investments     0 0  
Commercial Mortgage [Member]
          
Securitizations and Variable Interest Entities (Textual) [Abstract]          
Amount transferred related to mortgages to unconsolidated VIE 1,500,000,000 955,000,000 3,200,000,000 955,000,000  
Gain Loss on Transfer of Unconsolidated VIE Debt Investments 38,000,000 39,000,000 100,000,000 39,000,000  
Loans [Member]
          
Securitizations and Variable Interest Entities (Textual) [Abstract]          
Assets pledged to collateralize the borrowings of variable interest entity 6,500,000,000   6,500,000,000   6,400,000,000
Available for sale Securities [Member]
          
Securitizations and Variable Interest Entities (Textual) [Abstract]          
Assets pledged to collateralize the borrowings of variable interest entity 183,000,000   183,000,000   179,000,000
Cash and cash equivalents [Member]
          
Securitizations and Variable Interest Entities (Textual) [Abstract]          
Assets pledged to collateralize the borrowings of variable interest entity 180,000,000   180,000,000   138,000,000
Level 2 [Member] | Commercial Mortgage [Member]
          
Securitizations and Variable Interest Entities (Textual) [Abstract]          
Securities available for sale 23,000,000 41,000,000 23,000,000 41,000,000  
Level 3 [Member] | Residential Mortgage [Member]
          
Securitizations and Variable Interest Entities (Textual) [Abstract]          
Amount of servicing asset at fair value 2,000,000,000 2,600,000,000 2,000,000,000 2,600,000,000  
Amount of liability for repurchase reserves at fair value     98,000,000 134,000,000  
Level 3 [Member] | Commercial Mortgage [Member]
          
Securitizations and Variable Interest Entities (Textual) [Abstract]          
Amount of servicing asset at fair value 9,000,000 6,000,000 9,000,000 6,000,000  
Equity Interests [Member]
          
Securitizations and Variable Interest Entities (Textual) [Abstract]          
Total equity interest 5,800,000,000   5,800,000,000   5,800,000,000
Long-term debt [Member]
          
Securitizations and Variable Interest Entities (Textual) [Abstract]          
Private placement debt financing 6,000,000,000   6,000,000,000   6,000,000,000
Commercial Mortgage Servicing [Member]
          
Securitizations and Variable Interest Entities (Textual) [Abstract]          
Fair value of interests held 1,500,000,000   1,500,000,000   1,400,000,000
Decrease in fair value from 25% adverse change 184,000,000   184,000,000   139,000,000
Trust Preferred Securities [Member]
          
Securitizations and Variable Interest Entities (Textual) [Abstract]          
Trust Preferred Securities Notice Redeemed During Period, Value     2,800,000,000    
Trust Preferred Securities [Member] | Preferred stock [Member]
          
Securitizations and Variable Interest Entities (Textual) [Abstract]          
Carrying value - equity 2,500,000,000   2,500,000,000   2,500,000,000
Trust Preferred Securities [Member] | Junior Subordinated Debt [Member]
          
Securitizations and Variable Interest Entities (Textual) [Abstract]          
Carrying value - asset (liability) (2,000,000,000)   (2,000,000,000)   (4,900,000,000)
Other Investments [Member]
          
Securitizations and Variable Interest Entities (Textual) [Abstract]          
Securities Available for sale Portfolio of ARS issued by VIEs $ 704,000,000   $ 704,000,000   $ 686,000,000