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Fair Value Measurements - Summary of Changes in Level 3 Fair Value Category (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Level 3 [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Balance, beginning of period $ 14,019,216 $ 15,874,572
Additions of VIEs consolidated   (350,624)
Included in earnings 721,347 513,876
Included in other comprehensive income 650,373 (20,630)
Purchases      
Issuances (162,460)  
Sales   (16,600)
Settlements (439,649) (355,313)
Transfers in Level 3 (1,816,216) (905,195)
Transfers out of Level 3 1,443,877 880,154
Deconsolidation of VIEs   (1,601,024)
Balance, end of period 14,416,488 14,019,216
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 587,983 512,287
Investments contract [Member] | Level 3 [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Balance, beginning of period 2,199,338 1,904,361
Included in earnings (41,289) 311,842
Included in other comprehensive income 103,245 (16,865)
Purchases      
Balance, end of period 2,261,294 2,199,338
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 (41,289) 311,842
Loans [Member] | Level 3 [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Balance, beginning of period 14,126,994 15,800,918
Included in earnings 952,463 664,823
Included in other comprehensive income 637,954 (14,881)
Purchases      
Settlements (358,338) (428,899)
Deconsolidation of VIEs   (1,894,967)
Balance, end of period 15,359,073 14,126,994
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 952,944 664,823
Derivatives liabilities [Member] | Level 3 [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Balance, beginning of period   4,511
Included in earnings   (4,511)
Purchases      
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   (4,511)
Long-term debt [Member] | Level 3 [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Balance, beginning of period (1,934,642) (1,856,366)
Additions of VIEs consolidated   (350,624)
Included in earnings (208,678) (118,048)
Included in other comprehensive income (98,311) 11,240
Purchases      
Issuances (162,460)  
Settlements 64,781 35,241
Transfers in Level 3 (1,875,121) (905,664)
Transfers out of Level 3 1,257,930 955,636
Deconsolidation of VIEs   293,943
Balance, end of period (2,956,501) (1,934,642)
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 (208,678) (118,063)
Investment by class [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Balance, beginning of period 97,522 199,172
Included in earnings (3) (3,467)
Included in other comprehensive income 7,485 (124)
Purchases      
Sales   (16,600)
Settlements (97,206) (6,446)
Transfers in Level 3 58,905 469
Transfers out of Level 3 (6,301) (75,482)
Balance, end of period 60,402 97,522
Investment by class [Member] | Other Asset Backed Securities [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Balance, beginning of period 75,886 159,473
Included in other comprehensive income 7,051 (6,612)
Purchases      
Settlements (85,741) (1,493)
Transfers in Level 3 53,068  
Transfers out of Level 3   (75,482)
Balance, end of period 50,264 75,886
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 1,197
Included in earnings (2) (4)
Included in other comprehensive income (9) (4)
Purchases      
Settlements (749) (434)
Transfers in Level 3   469
Transfers out of Level 3 (464)  
Balance, end of period   1,224
Derivatives by class [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Balance, beginning of period (486,775) (195,933)
Included in earnings 21,076 (335,633)
Purchases      
Settlements (48,886) 44,791
Transfers out of Level 3 192,248  
Balance, end of period (322,337) (486,775)
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 (113,836) (340,674)
Investments [Member] | Level 3 [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Balance, beginning of period 97,522 199,172
Included in earnings (3) (3,467)
Included in other comprehensive income 7,485 (124)
Purchases      
Sales   (16,600)
Settlements (97,206) (6,446)
Transfers in Level 3 58,905 469
Transfers out of Level 3 (6,301) (75,482)
Balance, end of period 60,402 97,522
Other Assets [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Included in earnings (2,222) (1,130)
Other Assets [Member] | Level 3 [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Balance, beginning of period 16,779 17,909
Included in earnings (2,222) (1,130)
Purchases      
Balance, end of period 14,557 16,779
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 (2,222) (1,130)
Derivatives assets [Member] | Level 3 [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Balance, beginning of period (486,775) (195,933)
Included in earnings 21,076 (335,633)
Purchases      
Settlements (48,886) 44,791
Transfers out of Level 3 192,248  
Balance, end of period (322,337) (486,775)
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 (113,836) (340,674)
Collateralized debt obligations [Member] | Investment by class [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Balance, beginning of period 12,482 30,433
Included in earnings (5) (3,286)
Included in other comprehensive income 646 6,454
Purchases      
Sales   (16,600)
Settlements (6,641) (4,519)
Balance, end of period 6,482 12,482
Corporate obligations [Member] | Investment by class [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Balance, beginning of period 7,930 8,069
Included in earnings 4 (177)
Included in other comprehensive income (203) 38
Purchases      
Settlements (4,075)  
Transfers in Level 3 5,837  
Transfers out of Level 3 (5,837)  
Balance, end of period 3,656 7,930
Interest rate swaps [Member] | Derivatives by class [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Balance, beginning of period (302,177) 25,751
Included in earnings (70,415) (389,720)
Purchases      
Settlements 71,592 61,792
Transfers out of Level 3 192,248  
Balance, end of period (108,752) (302,177)
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 (78,505) (356,354)
Credit Derivatives [Member] | Derivatives by class [Member]
    
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]    
Balance, beginning of period (190,653) (221,684)
Included in earnings (9,219) 48,032
Purchases      
Settlements (13,713) (17,001)
Balance, end of period (213,585) (190,653)
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 (35,331) 9,625
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  
Included in earnings 100,710 6,055
Purchases      
Settlements (106,765)  
Balance, end of period   6,055
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   $ 6,055