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Fair Value of Derivative Contracts Falling under Early Termination Provisions in Net Liability Position (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
A3/A-
 
Credit Derivatives [Line Items]  
Potential close-out exposures (fair value) $ 893 [1]
Baa2/BBB
 
Credit Derivatives [Line Items]  
Potential close-out exposures (fair value) 1,235 [1]
Bal/BB+
 
Credit Derivatives [Line Items]  
Potential close-out exposures (fair value) $ 2,912 [1]
[1] The change between rating categories is incremental, not cumulative.