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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Balance, beginning of period | $ 13,626,233 | $ 14,095,050 | $ 14,019,216 | $ 15,874,571
Additions of VIEs consolidated |  |  |  | (350,624)
Included in earnings | 367,070 | 139,373 | 527,590 | 418,732
Included in other comprehensive income | 386,830 | (407,837) | 558,465 | 42,465
Issuances |  |  |  |
Sales |  |  |  | (16,600)
Settlements | (50,728) | (52,002) | (508,182) | (323,281)
Transfers in Level 3 | (576,272) | (192,773) | (1,494,714) | (448,913)
Transfers out of Level 3 |  | 40,754 | 650,758 | 321,182
Deconsolidation of VIEs |  |  |  | (1,894,967)
Balance, end of period | 13,753,133 | 13,662,565 | 13,753,133 | 13,662,565
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 | 363,599 | 162,300 | 409,121 | 425,901
Investments contract [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Balance, beginning of period | 2,162,062 | 2,023,513 | 2,199,338 | 1,904,361
Included in earnings | (64,826) | 145,804 | (127,539) | 210,393
Included in other comprehensive income | 62,877 | (62,870) | 88,314 | (8,307)
Issuances |  |  |  |
Balance, end of period | 2,160,113 | 2,106,447 | 2,160,113 | 2,106,447
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 | (64,826) | 145,830 | (127,539) | 210,393
Loan [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Balance, beginning of period | 14,238,273 | 14,442,912 | 14,126,994 | 15,800,918
Included in earnings | 439,649 | 126,130 | 738,121 | 481,446
Included in other comprehensive income | 392,548 | (389,166) | 541,215 | 51,354
Issuances |  |  |  |
Settlements | (85,811) | (132,909) | (421,671) | (391,784)
Deconsolidation of VIEs |  |  |  | (1,894,967)
Balance, end of period | 14,984,659 | 14,046,967 | 14,984,659 | 14,046,967
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 | 439,649 | 126,156 | 738,602 | 480,391
Derivatives Liability [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Balance, beginning of period |  |  |  | 4,511
Included in earnings |  |  |  | (4,511)
Issuances |  |  |  |
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] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Balance, beginning of period | (2,346,060) | (2,310,972) | (1,934,642) | (1,856,366)
Additions of VIEs consolidated |  |  |  | (350,624)
Included in earnings | (33,245) | 166,532 | (148,573) | 63,605
Included in other comprehensive income | (69,066) | 52,650 | (77,761) | (41)
Issuances |  |  |  |
Settlements | 31,302 | 12,765 | 64,195 | 40,113
Transfers in Level 3 | (576,272) | (192,773) | (1,553,619) | (448,913)
Transfers out of Level 3 |  | 116,237 | 657,059 | 396,665
Balance, end of period | (2,993,341) | (2,155,561) | (2,993,341) | (2,155,561)
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 | (33,245) | 166,532 | (148,573) | 63,605
Investment by class [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Balance, beginning of period | 63,770 | 183,433 | 97,522 | 199,172
Included in earnings | (22) |  | 17 |
Included in other comprehensive income | 471 | (47) | 6,697 | (3,419)
Purchases |  | (8,451) |  | (541)
Issuances |  |  |  |
Settlements | (3,497) |  | (96,118) | (16,600)
Transfers in Level 3 |  | (2,099) | 58,905 | (5,776)
Transfers out of Level 3 |  |  | (6,301) |
Deconsolidation of VIEs |  | (75,483) |  | (75,483)
Balance, end of period | 60,722 | 97,353 | 60,722 | 97,353
Investment by class [Member] | Other Asset Backed Securities [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Balance, beginning of period | 50,746 | 159,768 | 75,886 | 159,473
Included in other comprehensive income | 122 |  | 6,498 |
Purchases |  | (8,719) |  | (6,931)
Issuances |  |  |  |
Settlements | (573) |  | (85,157) |
Transfers in Level 3 |  |  | 53,068 | (1,493)
Transfers out of Level 3 |  | (75,483) |  |
Deconsolidation of VIEs |  |  |  | (75,483)
Balance, end of period | 50,295 | 75,566 | 50,295 | 75,566
Investment by class [Member] | U.S. Agency Obligations [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Balance, beginning of period |  | 984 | 1,224 | 1,197
Included in earnings |  |  | (2) |
Included in other comprehensive income |  | (10) | (9) | (3)
Purchases |  |  |  | (7)
Issuances |  |  |  |
Settlements |  |  | (749) |
Transfers in Level 3 |  |  |  | (213)
Transfers out of Level 3 |  |  | (464) |
Balance, end of period |  | 974 |  | 974
Derivatives by class [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Balance, beginning of period | (507,604) | (262,287) | (486,775) | (195,934)
Included in earnings | 26,285 | (297,927) | 67,322 | (328,205)
Issuances |  |  |  |
Settlements | 7,278 | 70,241 | (54,588) | 34,166
Balance, end of period | (474,041) | (489,973) | (474,041) | (489,973)
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 | 22,792 | (275,099) | (51,611) | (323,400)
Collateralized debt obligations [Member] | Investment by class [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Balance, beginning of period | 9,558 | 14,713 | 12,482 | 30,433
Included in earnings | (2) |  | (5) |
Included in other comprehensive income | 200 | (2) | 492 | (3,284)
Purchases |  | 52 |  | 6,185
Issuances |  |  |  |
Settlements | (2,924) |  | (6,137) | (16,600)
Transfers in Level 3 |  | (2,099) |  | (4,070)
Balance, end of period | 6,832 | 12,664 | 6,832 | 12,664
Corporate Obligations [Member] | Investment by class [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Balance, beginning of period | 3,466 | 7,968 | 7,930 | 8,069
Included in earnings | (20) |  | 24 |
Included in other comprehensive income | 149 | (45) | (284) | (132)
Purchases |  | 226 |  | 212
Issuances |  |  |  |
Settlements |  |  | (4,075) |
Transfers in Level 3 |  |  | 5,837 |
Transfers out of Level 3 |  |  | (5,837) |
Balance, end of period | 3,595 | 8,149 | 3,595 | 8,149
Interest Rate Swaps [Member] | Derivatives by class [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Balance, beginning of period | (295,987) | (67,210) | (302,177) | 25,750
Included in earnings | (1,156) | (295,523) | (46,191) | (361,955)
Issuances |  |  |  |
Settlements | 10,223 | 74,070 | 61,448 | 47,542
Balance, end of period | (286,920) | (288,663) | (286,920) | (288,663)
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 | (1,156) | (257,764) | (47,419) | (327,371)
Credit Derivative [Member] | Derivatives by class [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Balance, beginning of period | (211,617) | (215,847) | (190,653) | (221,684)
Included in earnings | 27,441 | 4,506 | 12,803 | 19,890
Issuances |  |  |  |
Settlements | (2,945) | (3,829) | (9,271) | (13,376)
Balance, end of period | (187,121) | (215,170) | (187,121) | (215,170)
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 | 23,948 | (10,425) | (4,192) | (9,889)
Call Option On Long Term Debt [Member] | Derivatives by class [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Balance, beginning of period |  | 20,770 | 6,055 |
Included in earnings |  | (6,910) | 100,710 | 13,860
Issuances |  |  |  |
Settlements |  |  | (106,765) |
Balance, end of period |  | 13,860 |  | 13,860
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 |  | (6,910) |  | 13,860
Investments [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Balance, beginning of period | 63,770 | 183,433 | 97,522 | 199,172
Included in earnings | (22) | (47) | 17 | (3,419)
Included in other comprehensive income | 471 | (8,451) | 6,697 | (541)
Issuances |  |  |  |
Sales |  |  |  | (16,600)
Settlements | (3,497) | (2,099) | (96,118) | (5,776)
Transfers in Level 3 |  |  | 58,905 |
Transfers out of Level 3 |  | (75,483) | (6,301) | (75,483)
Balance, end of period | 60,722 | 97,353 | 60,722 | 97,353
Other Assets [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Balance, beginning of period | 15,792 | 18,451 | 16,779 | 17,909
Included in earnings | (771) | (1,119) | (1,758) | (577)
Issuances |  |  |  |
Balance, end of period | 15,021 | 17,332 | 15,021 | 17,332
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 | (771) | (1,119) | (1,758) | (577)
Derivatives Assets [Member] |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items] |  |  |  |
Balance, beginning of period | (507,604) | (262,287) | (486,775) | (195,934)
Included in earnings | 26,285 | (297,927) | 67,322 | (328,205)
Issuances |  |  |  |
Settlements | 7,278 | (70,241) | (54,588) | 34,166
Balance, end of period | (474,041) | (489,973) | (474,041) | (489,973)
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 | $ 22,792 | $ (275,099) | $ (51,611) | $ (323,400)

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- Definition The amount of gains or losses included in earnings attributable to unrealized gains or losses on financial instruments measured on a recurring basis using unobservable inputs that are still held at the reporting date. + References No definition available. + Details
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- Definition Fair value measurement with unobservable inputs reconciliation recurring basis asset or liability. + References No definition available. + Details
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- Definition Fair value of financial instruments measured on a recurring basis using unobservable inputs added as a result of new consolidated variable interest entities. + References No definition available. + Details
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- Definition Fair value of financial instruments measured on a recurring basis using unobservable inputs removed as a result of the deconsolidation of variable interest entities. + References No definition available. + Details
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- Definition Amount of gain or loss included in earnings arising from financial instruments measured on a recurring basis using unobservable inputs. + References No definition available. + Details
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- Definition Amount of gain or loss included in other comprehensive income arising from financial instruments measured on a recurring basis using unobservable inputs. + References No definition available. + Details
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- Definition Amount of issuances related to financial instruments measured on a recurring basis using unobservable inputs. + References No definition available. + Details
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- Definition Amount of purchases of financial instruments measured on a recurring basis using unobservable inputs. + References No definition available. + Details
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- Definition Amount of sales of financial instruments measured on a recurring basis using unobservable inputs. + References No definition available. + Details
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- Definition Amount of settlements related to financial instruments measured on a recurring basis using unobservable inputs. + References No definition available. + Details
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- Definition Amount of change in fair value of financial instruments measured on a recurring basis using unobservable inputs arising from transfers into level 3 of the fair value hierarchy. + References No definition available. + Details
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- Definition Amount of change in fair value of financial instruments measured on a recurring basis using unobservable inputs arising from transfers out of level 3 of the fair value hierarchy. + References No definition available. + Details
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