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Derivative Instruments - Summary of Location and Amount of Gains and Losses of Derivative Contracts (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Derivative, gain (loss) on derivative, net, Total $ (5,709) $ (662,951) $ (174,947) $ (787,089)
Variable Interest Entity [Member]
       
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Derivative, gain (loss) on derivative, net, Total 2,858 (444,771) 26,101 (560,472)
Financial Services Derivatives Products [Member]
       
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Derivative, gain (loss) on derivative, net, Total (36,007) (215,775) (113,141) (260,366)
Credit Derivatives [Member] | Income (Loss) On Variable Interest Entities [Member] | Variable Interest Entity [Member]
       
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Derivative instruments, gain (loss) recognized in income, net, Total       (4,511)
Credit Derivatives [Member] | Financial Guarantee [Member] | Net Change In Fair Value Of Credit Derivatives [Member]
       
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Derivative instruments, gain (loss) recognized in income, net, Total 27,440 4,505 12,803 19,889
Interest Rate Swaps [Member] | Income (Loss) On Variable Interest Entities [Member] | Variable Interest Entity [Member]
       
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Derivative instruments, gain (loss) recognized in income, net, Total (2,723) (475,288) 42,514 (563,809)
Interest Rate Swaps [Member] | Financial Services Derivatives Products [Member] | Derivative Products [Member]
       
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Derivative instruments, gain (loss) recognized in income, net, Total (33,036) (206,455) (99,026) (240,715)
Currency Swaps [Member] | Income (Loss) On Variable Interest Entities [Member] | Variable Interest Entity [Member]
       
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Derivative instruments, gain (loss) recognized in income, net, Total 5,581 30,517 (16,413) 7,848
Currency Swaps [Member] | Financial Services Derivatives Products [Member] | Derivative Products [Member]
       
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Derivative instruments, gain (loss) recognized in income, net, Total 570 372 807 (184)
Foreign Exchange Future [Member] | Financial Services Derivatives Products [Member] | Derivative Products [Member]
       
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Derivative instruments, gain (loss) recognized in income, net, Total (3,485) (9,364) (15,247) (19,239)
Other Contracts [Member] | Financial Services Derivatives Products [Member] | Derivative Products [Member]
       
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Derivative instruments, gain (loss) recognized in income, net, Total (56) (328) 325 (228)
Third call option [Member] | Other (Loss) Income [Member]
       
Schedule of Trading Securities and Other Trading Assets [Line Items]        
Derivative instruments, gain (loss) recognized in income, net, Total   $ (6,910) $ (100,710) $ 13,860