v2.4.0.6
Variable Interest Entities and Securitization Activities (Mortgage Servicing Activities for SPEs) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Amounts past due 90 days or greater (unpaid principal balance) $ 800 $ 1,500
Unconsolidated SPEs | Residential Mortgage
    
Assets serviced (unpaid principal balance) 821 9,821
Amounts past due 90 days or greater (unpaid principal balance) 86 [1] 3,087 [1]
Percentage of amounts past due 90 days or greater 10.40% [1] 31.40% [1]
Credit losses 3 631
Unconsolidated SPEs | Commercial Mortgage
    
Assets serviced (unpaid principal balance) 4,760 5,750
Amounts past due 90 days or greater (unpaid principal balance) 0 [1] 0 [1]
Percentage of amounts past due 90 days or greater 0.00% [1] 0.00% [1]
Credit losses 0 0
Consolidated SPEs | Residential Mortgage
    
Assets serviced (unpaid principal balance) 1,141 2,180
Amounts past due 90 days or greater (unpaid principal balance) 43 [1] 354 [1]
Percentage of amounts past due 90 days or greater 3.80% [1] 16.20% [1]
Credit losses 2 81
Consolidated SPEs | Commercial Mortgage
    
Assets serviced (unpaid principal balance) 0 1,596
Amounts past due 90 days or greater (unpaid principal balance) 0 [1] 0 [1]
Percentage of amounts past due 90 days or greater 0.00% [1] 0.00% [1]
Credit losses $ 0 $ 0
[1] Amounts include loans that are at least 90 days contractually delinquent, loans for which the borrower has filed for bankruptcy, loans in foreclosure and real estate owned.