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Assets and Liabilities, by Type, of Consolidated Investment Management Funds Recorded at Fair Value (Detail) (Investment Management Funds, USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Investment Management Funds
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading assets $ 11,079 $ 10,751
Other assets 530 596
Total assets 11,609 11,347
Trading liabilities 10,290 10,053
Other liabilities 38 32
Total liabilities $ 10,328 $ 10,085