v2.4.0.6
Variable Interest Entities and Securitization Activities (Fair Value of Assets and Liabilities) (Details) (Special Purpose Entities, 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
Level 1
   
Retained interests (fair value) 0 0
Interests purchased in the secondary market (fair value) 0 0
Derivative assets (fair value) 0 0
Derivative liabilities (fair value) 0 0
Level 2
   
Retained interests (fair value) 1,560 1,260
Interests purchased in the secondary market (fair value) 756 764
Derivative assets (fair value) 774 869
Derivative liabilities (fair value) 295 541
Level 3
   
Retained interests (fair value) 1,652 1,624
Interests purchased in the secondary market (fair value) 45 118
Derivative assets (fair value) 353 572
Derivative liabilities (fair value) 30 30
Investment Grade
   
Retained interests (fair value) 1,546 1,189
Interests purchased in the secondary market (fair value) 623 640
Investment Grade | Level 1
   
Retained interests (fair value) 0 0
Interests purchased in the secondary market (fair value) 0 0
Investment Grade | Level 2
   
Retained interests (fair value) 1,476 1,186
Interests purchased in the secondary market (fair value) 617 638
Investment Grade | Level 3
   
Retained interests (fair value) 70 3
Interests purchased in the secondary market (fair value) 6 2
Noninvestment Grade
   
Retained interests (fair value) 1,666 1,695
Interests purchased in the secondary market (fair value) 178 242
Noninvestment Grade | Level 1
   
Retained interests (fair value) 0 0
Interests purchased in the secondary market (fair value) 0 0
Noninvestment Grade | Level 2
   
Retained interests (fair value) 84 74
Interests purchased in the secondary market (fair value) 139 126
Noninvestment Grade | Level 3
   
Retained interests (fair value) 1,582 1,621
Interests purchased in the secondary market (fair value) $ 39 $ 116