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Derivative Instruments (Details 1) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Summary of location and amount of gains and losses of derivative contracts        
Derivative, gain (loss) on derivative, net, Total $ (151,741) $ (194,582) $ 32,182 $ (124,138)
Variable Interest Entity, Primary Beneficiary [Member]
        
Summary of location and amount of gains and losses of derivative contracts        
Derivative, gain (loss) on derivative, net, Total (59,265) (157,320) 23,243 (115,701)
Credit Derivatives [Member] | Income (loss) on variable interest entities [Member] | Variable Interest Entity, Primary Beneficiary [Member]
        
Summary of location and amount of gains and losses of derivative contracts        
Derivative instruments, gain (loss) recognized in income, net, Total         (4,511)
Interest Rate Swap [Member] | Income (loss) on variable interest entities [Member] | Variable Interest Entity, Primary Beneficiary [Member]
        
Summary of location and amount of gains and losses of derivative contracts        
Derivative instruments, gain (loss) recognized in income, net, Total (48,478) (147,350) 45,237 (88,521)
Currency Swap [Member] | Income (loss) on variable interest entities [Member] | Variable Interest Entity, Primary Beneficiary [Member]
        
Summary of location and amount of gains and losses of derivative contracts        
Derivative instruments, gain (loss) recognized in income, net, Total (10,787) (9,970) (21,994) (22,669)
Financial Guarantee [Member] | Credit Derivatives [Member] | Net change in fair value of credit derivatives [Member]
        
Summary of location and amount of gains and losses of derivative contracts        
Derivative instruments, gain (loss) recognized in income, net, Total (7,415) 24,287 (14,637) 15,384
Financial Services Derivatives Products [Member]
        
Summary of location and amount of gains and losses of derivative contracts        
Derivative, gain (loss) on derivative, net, Total (124,091) (65,594) (77,134) (44,591)
Financial Services Derivatives Products [Member] | Interest Rate Swap [Member] | Derivative Products [Member]
        
Summary of location and amount of gains and losses of derivative contracts        
Derivative instruments, gain (loss) recognized in income, net, Total (108,175) (57,952) (65,990) (34,260)
Financial Services Derivatives Products [Member] | Currency Swap [Member] | Derivative Products [Member]
        
Summary of location and amount of gains and losses of derivative contracts        
Derivative instruments, gain (loss) recognized in income, net, Total 81 (354) 237 (556)
Financial Services Derivatives Products [Member] | Foreign Exchange Future [Member] | Derivative Products [Member]
        
Summary of location and amount of gains and losses of derivative contracts        
Derivative instruments, gain (loss) recognized in income, net, Total (16,070) (7,307) (11,762) (9,875)
Financial Services Derivatives Products [Member] | Other contracts [Member] | Derivative Products [Member]
        
Summary of location and amount of gains and losses of derivative contracts        
Derivative instruments, gain (loss) recognized in income, net, Total 73 19 381 100
Call Option [Member] | Other income [Member]
        
Summary of location and amount of gains and losses of derivative contracts        
Derivative instruments, gain (loss) recognized in income, net, Total $ 39,030 $ 4,045 $ 100,710 $ 20,770