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Offsetting Derivatives and Other Financial Assets (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Assets
   
Derivative Fair Value Gross Amount Assets Not Offset Against Collateral Net    
Gross amount recognized in the balance sheet $ 1,586 [1] $ 1,735 [1]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral (262) (291)
Derivative, Collateral, Obligation to Return Cash (743) [2] (794) [2]
Derivative, Fair Value, Amount Offset Against Collateral, Net 581 650
Liability
   
Derivative Fair Value Gross Amount Liabilities Not Offset Against Collateral Net    
Gross amount recognized in the balance sheet 865 [1] 915 [1]
Derivative Liability, Fair Value, Amount Not Offset Against Collateral (262) (291)
Derivative, Collateral, Right to Reclaim Cash (463) [2] (505) [2]
Derivative Fair Value Amount Offset Against Collateral Net 140 119
Derivative | Assets
   
Derivative Fair Value Gross Amount Assets Not Offset Against Collateral Net    
Gross amount recognized in the balance sheet 1,586 [1] 1,735 [1]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral (262) (291)
Derivative, Collateral, Obligation to Return Cash (743) [2] (794) [2]
Derivative, Fair Value, Amount Offset Against Collateral, Net 581 650
Derivative | Liability
   
Derivative Fair Value Gross Amount Liabilities Not Offset Against Collateral Net    
Gross amount recognized in the balance sheet 865 [1] 915 [1]
Derivative Liability, Fair Value, Amount Not Offset Against Collateral (262) (291)
Derivative, Collateral, Right to Reclaim Cash (463) [2] (505) [2]
Derivative Fair Value Amount Offset Against Collateral Net $ 140 $ 119
[1] Amount does not include stock warrants associated with sale of the processing business and interest rate lock commitments, because these instruments are not subject to master netting or similar arrangement.
[2] Amount of collateral received as an offset to asset positions or pledged as an offset to liability positions. Collateral values in excess of amounts recognized in the Condensed Consolidated Balance Sheets were excluded from this table