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Guarantee Arrangements and Pledged Assets - Summary of Pledged Assets Included in Consolidated Balance Sheet (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Interest bearing deposits with banks $ 917 $ 4,426
Trading assets 5,384 1,640
Securities available-for-sale 18,481 23,347
Securities held to maturity 346 476
Loans 1,736 2,113
Other assets 2,476 3,688
Total $ 29,340 $ 35,690