v2.4.0.6
Variable Interest Entitiesand Securitization Activities (Information Regarding SPEs) (Details) (Special Purpose Entities, USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Retained interests (fair value) $ 3,055 $ 2,884
Interests purchased in the secondary market (fair value) 736 882
Derivative assets (fair value) 1,144 1,441
Derivative liabilities (fair value) 420 571
Primary Lending Commitments - Investment Grade
   
Retained interests (fair value) 1,442 1,189
Interests purchased in the secondary market (fair value) 63 640
Primary Lending Commitments - Non-investment Grade
   
Retained interests (fair value) 1,613 1,695
Interests purchased in the secondary market (fair value) 673 242
Residential Mortgage Loans
   
SPE assets (unpaid principal balance) 39,902 [1] 41,977 [1]
Retained interests (fair value) 93 120
Interests purchased in the secondary market (fair value) 112 194
Derivative assets (fair value) 9 18
Derivative liabilities (fair value) 24 30
Residential Mortgage Loans | Primary Lending Commitments - Investment Grade
   
Retained interests (fair value) 0 14
Interests purchased in the secondary market (fair value) 0 45
Residential Mortgage Loans | Primary Lending Commitments - Non-investment Grade
   
Retained interests (fair value) 93 106
Interests purchased in the secondary market (fair value) 112 149
Commercial Mortgage Loans
   
SPE assets (unpaid principal balance) 70,531 [1] 85,333 [1]
Retained interests (fair value) 62 66
Interests purchased in the secondary market (fair value) 206 246
Derivative assets (fair value) 970 1,200
Derivative liabilities (fair value) 1 31
Commercial Mortgage Loans | Primary Lending Commitments - Investment Grade
   
Retained interests (fair value) 0 22
Interests purchased in the secondary market (fair value) 0 164
Commercial Mortgage Loans | Primary Lending Commitments - Non-investment Grade
   
Retained interests (fair value) 62 44
Interests purchased in the secondary market (fair value) 206 82
U.S. Agency Collateralized Mortgage Obligations [Member]
   
SPE assets (unpaid principal balance) 12,993 [1] 33,728 [1]
Retained interests (fair value) 1,442 1,151
Interests purchased in the secondary market (fair value) 31 20
Derivative assets (fair value) 0 0
Derivative liabilities (fair value) 0 0
U.S. Agency Collateralized Mortgage Obligations [Member] | Primary Lending Commitments - Investment Grade
   
Retained interests (fair value) 1,442 1,151
Interests purchased in the secondary market (fair value) 31 20
U.S. Agency Collateralized Mortgage Obligations [Member] | Primary Lending Commitments - Non-investment Grade
   
Retained interests (fair value) 0 0
Interests purchased in the secondary market (fair value) 0 0
Credit-Linked Notes and Other
   
SPE assets (unpaid principal balance) 13,195 [1] 14,315 [1]
Retained interests (fair value) 1,458 1,547
Interests purchased in the secondary market (fair value) 387 422
Derivative assets (fair value) 165 223
Derivative liabilities (fair value) 395 510
Credit-Linked Notes and Other | Primary Lending Commitments - Investment Grade
   
Retained interests (fair value) 0 2
Interests purchased in the secondary market (fair value) 32 411
Credit-Linked Notes and Other | Primary Lending Commitments - Non-investment Grade
   
Retained interests (fair value) 1,458 1,545
Interests purchased in the secondary market (fair value) $ 355 $ 11
[1] Amounts include assets transferred by unrelated transferors.