v2.4.0.6
Variable Interest Entitiesand Securitization Activities (Information Regarding SPEs) (Details) (Special Purpose Entities [Member], USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Retained interests (fair value) $ 3,212 $ 2,884
Interests purchased in the secondary market (fair value) 801 882
Derivative assets (fair value) 1,127 1,441
Derivative liabilities (fair value) 325 571
Investment Grade [Member]
   
Retained interests (fair value) 1,546 1,189
Interests purchased in the secondary market (fair value) 623 640
Noninvestment Grade [Member]
   
Retained interests (fair value) 1,666 1,695
Interests purchased in the secondary market (fair value) 178 242
Residential Mortgage
   
SPE assets (unpaid principal balance) 36,750 [1] 41,977 [1]
Retained interests (fair value) 55 120
Interests purchased in the secondary market (fair value) 124 194
Derivative assets (fair value) 2 18
Derivative liabilities (fair value) 22 30
Residential Mortgage | Investment Grade [Member]
   
Retained interests (fair value) 1 14
Interests purchased in the secondary market (fair value) 11 45
Residential Mortgage | Noninvestment Grade [Member]
   
Retained interests (fair value) 54 106
Interests purchased in the secondary market (fair value) 113 149
Commercial Mortgage Loans [Member]
   
SPE assets (unpaid principal balance) 70,824 [1] 85,333 [1]
Retained interests (fair value) 186 66
Interests purchased in the secondary market (fair value) 158 246
Derivative assets (fair value) 948 1,200
Derivative liabilities (fair value) 0 31
Commercial Mortgage Loans [Member] | Investment Grade [Member]
   
Retained interests (fair value) 77 22
Interests purchased in the secondary market (fair value) 124 164
Commercial Mortgage Loans [Member] | Noninvestment Grade [Member]
   
Retained interests (fair value) 109 44
Interests purchased in the secondary market (fair value) 34 82
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
   
SPE assets (unpaid principal balance) 17,787 [1] 33,728 [1]
Retained interests (fair value) 1,468 1,151
Interests purchased in the secondary market (fair value) 99 20
Derivative assets (fair value) 0 0
Derivative liabilities (fair value) 0 0
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Investment Grade [Member]
   
Retained interests (fair value) 1,468 1,151
Interests purchased in the secondary market (fair value) 99 20
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Noninvestment Grade [Member]
   
Retained interests (fair value) 0 0
Interests purchased in the secondary market (fair value) 0 0
Credit-Linked Notes and Other [Member]
   
SPE assets (unpaid principal balance) 14,701 [1] 14,315 [1]
Retained interests (fair value) 1,503 1,547
Interests purchased in the secondary market (fair value) 420 422
Derivative assets (fair value) 177 223
Derivative liabilities (fair value) 303 510
Credit-Linked Notes and Other [Member] | Investment Grade [Member]
   
Retained interests (fair value) 0 2
Interests purchased in the secondary market (fair value) 389 411
Credit-Linked Notes and Other [Member] | Noninvestment Grade [Member]
   
Retained interests (fair value) 1,503 1,545
Interests purchased in the secondary market (fair value) $ 31 $ 11
[1] Amounts include assets transferred by unrelated transferors.