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Fair Value Measurements - Summary of Changes in Level 3 Fair Value Category (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Level 3 [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Balance, beginning of period $ 14,416,488 $ 14,019,216
Additions of VIEs consolidated      
Included in earnings 566,845 68,808
Included in other comprehensive income (904,833) 428,609
Purchases      
Issuances      
Sales      
Settlements (688,875) (230,319)
Transfers in Level 3    (606,359)
Transfers out of Level 3 974,536   
Deconsolidation of VIEs      
Balance, end of period 14,364,161 13,679,955
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date 564,346 54,256
Investments contract [Member] | Level 3 [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Balance, beginning of period 2,261,294 2,199,338
Additions of VIEs consolidated      
Included in earnings 297,294 (82,816)
Included in other comprehensive income (143,981) 68,143
Purchases      
Issuances     
Sales      
Transfers in Level 3     
Transfers out of Level 3     
Deconsolidation of VIEs      
Balance, end of period 2,414,607 2,184,665
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date 297,294 (82,816)
Loans [Member] | Level 3 [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Balance, beginning of period 15,359,073 14,126,994
Additions of VIEs consolidated      
Included in earnings 400,456 166,665
Included in other comprehensive income (955,455) 415,857
Purchases      
Issuances     
Sales      
Settlements (687,263) (249,439)
Transfers in Level 3     
Transfers out of Level 3     
Deconsolidation of VIEs      
Balance, end of period 14,116,811 14,460,077
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date 400,456 167,146
Long-term debt [Member] | Level 3 [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Balance, beginning of period (2,956,501) (1,934,642)
Additions of VIEs consolidated      
Included in earnings (127,393) (136,563)
Included in other comprehensive income 193,905 (63,205)
Purchases      
Issuances     
Sales      
Settlements 4,864 13,030
Transfers in Level 3    (665,264)
Transfers out of Level 3 974,536   
Deconsolidation of VIEs      
Balance, end of period (1,910,589) (2,786,644)
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date (127,393) (136,563)
Investment by class [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Balance, beginning of period 60,402 97,522
Included in earnings (23) (49)
Included in other comprehensive income 698 7,814
Purchases      
Issuances      
Sales      
Settlements (3,286) (2,742)
Transfers in Level 3    58,905
Transfers out of Level 3      
Balance, end of period 57,791 161,450
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date      
Investment by class [Member] | Other Asset Backed Securities [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Balance, beginning of period 50,264 75,886
Included in other comprehensive income 569 8,072
Purchases      
Issuances      
Sales      
Settlements (599)  
Transfers in Level 3    53,068
Transfers out of Level 3      
Balance, end of period 50,234 137,026
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date      
Investment by class [Member] | U.S. Agency Obligations [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Balance, beginning of period   1,224
Included in earnings   (1)
Included in other comprehensive income   (5)
Purchases      
Issuances      
Sales      
Transfers in Level 3     
Transfers out of Level 3      
Balance, end of period   1,218
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date      
Derivatives by class [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Balance, beginning of period (322,337) (486,775)
Additions of VIEs consolidated      
Included in earnings (3,162) 122,327
Included in other comprehensive income      
Purchases      
Issuances      
Sales      
Settlements (3,190) 8,832
Transfers in Level 3      
Transfers out of Level 3      
Deconsolidation of VIEs      
Balance, end of period (328,689) (355,616)
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date (5,684) 107,245
Investments [Member] | Level 3 [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Balance, beginning of period 60,402 97,522
Additions of VIEs consolidated      
Included in earnings (23) (49)
Included in other comprehensive income 698 7,814
Purchases     
Issuances     
Sales     
Settlements (3,286) (2,742)
Transfers in Level 3    58,905
Transfers out of Level 3     
Deconsolidation of VIEs      
Balance, end of period 57,791 161,450
Other assets [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Included in earnings (327) (756)
Other assets [Member] | Level 3 [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Balance, beginning of period 14,557 16,779
Additions of VIEs consolidated      
Included in earnings (327) (756)
Purchases      
Issuances     
Sales      
Transfers in Level 3     
Transfers out of Level 3     
Deconsolidation of VIEs      
Balance, end of period 14,230 16,023
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date (327) (756)
Derivatives assets [Member] | Level 3 [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Balance, beginning of period (322,337) (486,775)
Additions of VIEs consolidated      
Included in earnings (3,162) 122,327
Purchases      
Issuances     
Sales      
Settlements (3,190) 8,832
Transfers in Level 3     
Transfers out of Level 3     
Deconsolidation of VIEs      
Balance, end of period (328,689) (355,616)
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date (5,684) 107,245
Collateralized debt obligations [Member] | Investment by class [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Balance, beginning of period 6,482 12,482
Included in earnings (3) (2)
Included in other comprehensive income 113 101
Purchases      
Issuances      
Sales      
Settlements (2,687) (2,742)
Transfers in Level 3     
Transfers out of Level 3      
Balance, end of period 3,905 9,839
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date      
Corporate obligations [Member] | Investment by class [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Balance, beginning of period 3,656 7,930
Included in earnings (20) (46)
Included in other comprehensive income 16 (354)
Purchases      
Issuances      
Sales      
Transfers in Level 3    5,837
Transfers out of Level 3      
Balance, end of period 3,652 13,367
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date      
Interest rate swaps [Member] | Derivatives by class [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Balance, beginning of period (108,752) (302,177)
Additions of VIEs consolidated      
Included in earnings (15,949) 67,869
Included in other comprehensive income      
Purchases      
Issuances      
Sales      
Settlements (681) 12,086
Transfers in Level 3      
Transfers out of Level 3      
Deconsolidation of VIEs      
Balance, end of period (125,382) (222,222)
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date (15,949) 61,598
Credit Derivatives [Member] | Derivatives by class [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Balance, beginning of period (213,585) (190,653)
Additions of VIEs consolidated      
Included in earnings 12,787 (7,222)
Included in other comprehensive income      
Purchases      
Issuances      
Sales      
Settlements (2,509) (3,254)
Transfers in Level 3      
Transfers out of Level 3      
Deconsolidation of VIEs      
Balance, end of period (203,307) (201,129)
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date 10,265 (16,033)
Call options on long-term debt [Member] | Derivatives by class [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Balance, beginning of period    6,055
Additions of VIEs consolidated      
Included in earnings    61,680
Included in other comprehensive income      
Purchases      
Issuances      
Sales      
Settlements      
Transfers in Level 3      
Transfers out of Level 3      
Deconsolidation of VIEs      
Balance, end of period    67,735
The amount of total gains/(losses) included in earnings attributable to the change in unrealized gains or losses relating to assets and liabilities still held at the reporting date    $ 61,680