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Derivative Instruments (Total Fair Value Of Company's Derivative Assets And Liabilities By Instrument And Balance Sheet Location, Before Counterparty Netting) (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Derivative [Line Items] |  |  |  |
Derivative Instruments, Designated as hedging instruments |  |  | $ 241 |
Derivative Instruments, Not designated as hedging instruments | 58,640 |  | 87,616 |
Notional Amount Outstanding, Total derivatives | 58,640 |  | 87,857 |
Derivative Liabilities [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Liabilities, Designated, Fair Value |  |  | (44) | [1]
Derivative Liabilities, Not designated, Fair Value | (3,425) | [2] | (6,064) | [1]
Derivative liabilities, Total derivatives | (3,425) | [2] | (6,108) | [1]
Derivative Assets [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Assets, Designated, Fair Value |  |  | 10 | [1]
Derivative Assets, Not designated, Fair Value | 102 | [2] | 542 | [1]
Derivative assets, Total derivatives | 102 | [2] | 552 | [1]
Insured Credit Default Swaps [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments, Not designated as hedging instruments | 47,320 |  | 66,851 |
Insured Credit Default Swaps [Member] | Derivative Liabilities [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Liabilities, Not designated, Fair Value | (2,858) | [2] | (4,708) | [1]
Insured Swaps [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments, Not designated as hedging instruments | 5,817 |  | 7,156 |
Insured Swaps [Member] | Derivative Liabilities [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Liabilities, Not designated, Fair Value | (8) | [2] | (9) | [1]
Non-Insured Credit Default Swaps [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments, Not designated as hedging instruments | 10 |  | 30 |
Non-Insured Credit Default Swaps [Member] | Other Assets [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Assets, Not designated, Fair Value |  |  | 1 | [1]
Interest Rate Swaps [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments, Designated as hedging instruments |  |  | 241 |
Derivative Instruments, Not designated as hedging instruments | 1,637 |  | 2,706 |
Interest Rate Swaps [Member] | Derivative Liabilities [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Liabilities, Designated, Fair Value |  |  | (44) | [1]
Derivative Liabilities, Not designated, Fair Value | (290) | [2] | (401) | [1]
Interest Rate Swaps [Member] | Other Assets [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Assets, Designated, Fair Value |  |  | 10 | [1]
Derivative Assets, Not designated, Fair Value | 94 | [2] | 84 | [1]
Interest Rate Swaps-VIE [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments, Not designated as hedging instruments | 2,728 |  | 4,878 |
Interest Rate Swaps-VIE [Member] | Derivative Liabilities-VIE [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Liabilities, Not designated, Fair Value | (141) | [2] | (281) | [1]
Interest Rate Swaps-Embedded [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments, Not designated as hedging instruments | 483 |  | 480 |
Interest Rate Swaps-Embedded [Member] | Medium-Term Notes [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Assets, Not designated, Fair Value | 8 | [2] | 7 | [1]
Derivative Liabilities, Not designated, Fair Value | (35) | [2] | (14) | [1]
Currency Swap [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments, Not designated as hedging instruments | 40 |  | 62 |
Currency Swap [Member] | Derivative Liabilities [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Liabilities, Not designated, Fair Value | (3) | [2] | (4) | [1]
Currency Swaps-VIE [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments, Not designated as hedging instruments | 110 |  | 123 |
Currency Swaps-VIE [Member] | Derivative Liabilities-VIE [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Liabilities, Not designated, Fair Value | (21) | [2] | (17) | [1]
All Other [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments, Not designated as hedging instruments | 195 |  | 3,465 |
All Other [Member] | Derivative Liabilities [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Liabilities, Not designated, Fair Value | (68) | [2] | (91) | [1]
All Other-VIE [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments, Not designated as hedging instruments | 280 |  | 472 |
All Other-VIE [Member] | Derivative Assets-VIE [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Assets, Not designated, Fair Value |  |  | 3 | [1]
All Other-Embedded [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments, Not designated as hedging instruments | 20 |  | 121 |
All Other-Embedded [Member] | Derivative Liabilities, Other Investments [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Liabilities, Not designated, Fair Value | (1) | [2] | (12) | [1]
Non-Insured Credit Default Swaps-VIE [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments, Not designated as hedging instruments |  |  | 1,272 |
Non-Insured Credit Default Swaps-VIE [Member] | Derivative Liabilities-VIE [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Liabilities, Not designated, Fair Value |  |  | (527) | [1]
Non-Insured Credit Default Swaps-VIE [Member] | Derivative Assets-VIE [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Assets, Not designated, Fair Value |  |  | $ 447 | [1]
[1] | In accordance with the accounting guidance for derivative instruments and hedging activities, the balance sheet location of the Company's embedded derivative instruments is determined by the location of the related host contract
[2] | In accordance with the accounting guidance for derivative instruments and hedging activities, the balance sheet location of the Company's embedded derivative instruments is determined by the location of the related host contract.

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value of derivative Asset Designated As Hedging Instrument, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. + References No definition available. + Details
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- Definition Fair value of derivative Asset Not Designated As Hedging Instrument, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. + References No definition available. + Details
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- Definition Fair value of derivative liability Designated As Hedging Instrument, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. + References No definition available. + Details
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- Definition Fair value of derivative liability Not Designated As Hedging Instrument, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. + References No definition available. + Details
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- Definition Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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- Definition Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -Clause 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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- Definition Aggregate notional amount of all derivatives designated as a fair value hedging instrument. The notional amount relates to a number of currency units, shares, bushels, pounds, or other units specified in a derivative instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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- Definition Aggregate notional amount of all derivatives not designated as a hedging instrument. The notional amount relates to a number of currency units, shares, bushels, pounds, or other units specified in a derivative instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 + Details
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