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Derivative Instruments (Effect Of Derivative Instruments On Consolidated Statements Of Operations) (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Not Designated As Hedging Instruments [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income | $ 1,445 | $ (2,960) | $ (912)
Fair Value Hedging [Member] |  |  |
Derivative [Line Items] |  |  |
Gain (Loss) Recognized in Income on Derivative | 12 | (6) | (42)
Gain (Loss) Recognized in Income on Hedged Item | (12) | 6 | 41
Net Gain (Loss) Recognized in Income | (3) | (9) | (6)
Unrealized Gains (Losses) On Insured Derivatives [Member] | Insured Credit Default Swaps [Member] | Not Designated As Hedging Instruments [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income | 1,847 | (389) | (596)
Unrealized Gains (Losses) On Insured Derivatives [Member] | All Other [Member] | Not Designated As Hedging Instruments [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income | 22 | (52) | (13)
Unrealized Gains (Losses) On Insured Derivatives [Member] | Insured Swaps [Member] | Not Designated As Hedging Instruments [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income | 1 |  | 2
Realized Gains (Losses) And Other Settlements On Insured Derivatives [Member] | Insured Credit Default Swaps [Member] | Not Designated As Hedging Instruments [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income | (406) | (2,371) | (162)
Foreign Exchange And Other Derivative Financial Instruments [Member] | Non-Insured Credit Default Swaps [Member] | Not Designated As Hedging Instruments [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income | (1) | (2) | (1)
Foreign Exchange And Other Derivative Financial Instruments [Member] | Interest Rate Swaps [Member] | Not Designated As Hedging Instruments [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income | (75) | (193) | (138)
Foreign Exchange And Other Derivative Financial Instruments [Member] | Interest Rate Swaps [Member] | Fair Value Hedging [Member] |  |  |
Derivative [Line Items] |  |  |
Gain (Loss) Recognized in Income on Derivative | 12 | (8) | (42)
Gain (Loss) Recognized in Income on Hedged Item | (12) | 8 | 41
Net Gain (Loss) Recognized in Income |  |  | (1)
Foreign Exchange And Other Derivative Financial Instruments [Member] | Currency Swap [Member] | Not Designated As Hedging Instruments [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income | (2) | (1) | 10
Foreign Exchange And Other Derivative Financial Instruments [Member] | Currency Swap [Member] | Fair Value Hedging [Member] |  |  |
Derivative [Line Items] |  |  |
Gain (Loss) Recognized in Income on Derivative |  | 2 |
Gain (Loss) Recognized in Income on Hedged Item |  | (2) |
Foreign Exchange And Other Derivative Financial Instruments [Member] | All Other [Member] | Not Designated As Hedging Instruments [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income | 11 | (6) | (17)
Foreign Exchange And Other Derivative Financial Instruments [Member] | Credit Linked Notes [Member] | Not Designated As Hedging Instruments [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income |  |  | 18
Net Gains (Losses) On Financial Instruments At Fair Value And Foreign Exchange-VIE [Member] | Non-Insured Credit Default Swaps-VIE [Member] | Not Designated As Hedging Instruments [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income | (1) | 12 | (24)
Net Gains (Losses) On Financial Instruments At Fair Value And Foreign Exchange-VIE [Member] | Interest Rate Swaps-VIE [Member] | Not Designated As Hedging Instruments [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income | 55 | 53 | 25
Net Gains (Losses) On Financial Instruments At Fair Value And Foreign Exchange-VIE [Member] | Currency Swaps-VIE [Member] | Not Designated As Hedging Instruments [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income | (4) | (3) |
Net Gains (Losses) On Financial Instruments At Fair Value And Foreign Exchange-VIE [Member] | All Other-VIE [Member] | Not Designated As Hedging Instruments [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income | (2) | (8) | (16)
Interest Income (Expense) [Member] | Interest Rate Swaps [Member] | Fair Value Hedging [Member] |  |  |
Derivative [Line Items] |  |  |
Net Gain (Loss) Recognized in Income | $ (3) | $ (9) | $ (5)

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- Definition The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 + Details
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- Definition Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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