v2.4.0.6
Fair Value Disclosures (Net Gains (Losses) Due to Changes in Fair Value for Items Measured at Fair Value Pursuant to the Fair Value Option Election) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Federal Funds Sold and Securities Purchased under Agreements to Resell
     
Gains (losses) due to changes in fair value $ 13 $ 12  
Deposits
     
Gains (losses) due to changes in fair value (29) (51) (171)
Commercial Paper and Other Short-term Borrowings
     
Gains (losses) due to changes in fair value (31) [1] 567 [1] (8) [1]
Securities Sold under Agreements to Repurchase
     
Gains (losses) due to changes in fair value (19) (4) 8
Long-term Borrowings
     
Gains (losses) due to changes in fair value (7,008) [1] 3,129 [1] (1,721) [1]
Principal Transactions-Trading
     
Gains (losses) due to changes in fair value attributable to changes in the credit quality of the Company (4,402) 3,681 (873)
Principal Transactions-Trading | Federal Funds Sold and Securities Purchased under Agreements to Resell
     
Gains (losses) due to changes in fair value 8 12  
Principal Transactions-Trading | Deposits
     
Gains (losses) due to changes in fair value 57 66 2
Principal Transactions-Trading | Commercial Paper and Other Short-term Borrowings
     
Gains (losses) due to changes in fair value (31) [1] 567 [1] (8) [1]
Principal Transactions-Trading | Securities Sold under Agreements to Repurchase
     
Gains (losses) due to changes in fair value (15) 3 9
Principal Transactions-Trading | Long-term Borrowings
     
Gains (losses) due to changes in fair value (5,687) [1] 4,204 [1] (872) [1]
Interest Income (Expense) | Federal Funds Sold and Securities Purchased under Agreements to Resell
     
Gains (losses) due to changes in fair value 5 0  
Interest Income (Expense) | Deposits
     
Gains (losses) due to changes in fair value (86) (117) (173)
Interest Income (Expense) | Commercial Paper and Other Short-term Borrowings
     
Gains (losses) due to changes in fair value 0 [1] 0 [1] 0 [1]
Interest Income (Expense) | Securities Sold under Agreements to Repurchase
     
Gains (losses) due to changes in fair value (4) (7) (1)
Interest Income (Expense) | Long-term Borrowings
     
Gains (losses) due to changes in fair value $ (1,321) [1] $ (1,075) [1] $ (849) [1]
[1] (1)        Of the total gains (losses) recorded in Principal transactions—Trading for short-term and long-term borrowings for 2012, 2011 and 2010, $(4,402) million, $3,681 million and $(873) million, respectively, are attributable to changes in the credit quality of the Company, and the respective remainder is attributable to changes in foreign currency rates or interest rates or movements in the reference price or index for structured notes before the impact of related hedges.