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Derivative Instruments- Fair Value of Derivative Contracts Falling under Early Termination Provisions in Net Liability Position (Detail)
$ in Millions
Jun. 30, 2015
USD ($)
A-  
Credit Derivatives [Line Items]  
Potential close-out exposures (fair value) [1] $ 84
BBB  
Credit Derivatives [Line Items]  
Potential close-out exposures (fair value) [1] 1,170
BB plus  
Credit Derivatives [Line Items]  
Potential close-out exposures (fair value) [1] 1,803
A3  
Credit Derivatives [Line Items]  
Potential close-out exposures (fair value) [1] 84
Baa2  
Credit Derivatives [Line Items]  
Potential close-out exposures (fair value) [1] 1,170
Ba1  
Credit Derivatives [Line Items]  
Potential close-out exposures (fair value) [1] $ 1,803
[1] The amounts represent potential total close-out values if The Bank of New York Mellon’s rating were to immediately drop to the indicated levels.