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Derivative Instruments (Schedule Of Total Fair Value Of Company's Derivative Assets And Liabilities By Instrument And Balance Sheet Location) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Derivative [Line Items] |  |  |  |
Derivative Instruments, Designated as hedging instruments | $ 241 |  | $ 414 |
Total Derivative Instruments, Not designated as hedging instruments | 87,616 |  | 137,642 |
Derivative Assets, Designated | 10 | [1] | 16 | [1]
Derivative assets, Not designated | 542 | [1] | 753 | [1]
Derivative assets, Total derivatives | 552 | [1] | 769 | [1]
Derivative liabilities, Designated | (44) | [1] | (43) | [1]
Derivative liabilities, Not designated | (6,064) | [1] | (6,755) | [1]
Derivative liabilities, Total derivatives | (6,108) | [1] | (6,798) | [1]
Notional Amount Outstanding, Total derivatives | 87,857 |  | 138,056 |
Interest Rate Swaps [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments, Designated as hedging instruments | 241 |  | 394 |
Derivative Instruments, Not designated as hedging instruments | 2,706 |  | 3,480 |
Currency Swaps [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments, Designated as hedging instruments |  |  | 20 |
Derivative Instruments, Not designated as hedging instruments | 62 |  | 47 |
Currency Swaps -VIE [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments, Not designated as hedging instruments | 123 |  | 137 |
Insured Credit Default Swaps [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments, Not designated as hedging instruments | 66,851 |  | 99,331 |
Insured Swaps [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments, Not designated as hedging instruments | 7,156 |  | 10,537 |
Non-Insured Credit Default Swaps [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments, Not designated as hedging instruments | 30 |  | 35 |
Non-Insured Credit Default Swaps-VIE [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments, Not designated as hedging instruments | 1,272 |  | 3,973 |
Interest Rate Swaps-VIE [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments, Not designated as hedging instruments | 4,878 |  | 14,054 |
Interest Rate Swaps-Embedded [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments, Not designated as hedging instruments | 480 |  | 493 |
Interest Rate Swaps-Embedded-VIE [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments, Not designated as hedging instruments |  |  | 100 |
All Others [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments, Not designated as hedging instruments | 3,465 |  | 4,644 |
All Other-VIE [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments, Not designated as hedging instruments | 472 |  | 592 |
All Other-Embedded [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Instruments, Not designated as hedging instruments | 121 |  | 219 |
Derivative liabilities, Not designated |  |  | (9) | [1]
Derivative Assets [Member] | Interest Rate Swaps [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative Assets, Designated | 10 | [1] | 16 | [1]
Derivative assets, Not designated | 84 | [1] | 46 | [1]
Derivative Assets [Member] | Non-Insured Credit Default Swaps [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative assets, Not designated | 1 | [1] | 3 | [1]
Derivative Liabilities [Member] | Interest Rate Swaps [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative liabilities, Designated | (44) | [1] | (41) | [1]
Derivative liabilities, Not designated | (401) | [1] | (255) | [1]
Derivative Liabilities [Member] | Currency Swaps [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative liabilities, Designated |  |  | (2) | [1]
Derivative liabilities, Not designated | (4) | [1] | (4) | [1]
Derivative Liabilities [Member] | Insured Credit Default Swaps [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative liabilities, Not designated | (4,708) | [1] | (4,325) | [1]
Derivative Liabilities [Member] | Insured Swaps [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative liabilities, Not designated | (9) | [1] | (11) | [1]
Derivative Liabilities [Member] | All Others [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative liabilities, Not designated | (91) | [1] | (40) | [1]
Derivative Assets VIE [Member] | Non-Insured Credit Default Swaps-VIE [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative assets, Not designated | 447 | [1] | 687 | [1]
Derivative Assets VIE [Member] | Interest Rate Swaps-VIE [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative assets, Not designated |  |  | 2 | [1]
Derivative Assets VIE [Member] | All Other-VIE [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative assets, Not designated | 3 | [1] | 10 | [1]
Derivative Liabilities VIE [Member] | Currency Swaps -VIE [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative liabilities, Not designated | (17) | [1] | (14) | [1]
Derivative Liabilities VIE [Member] | Non-Insured Credit Default Swaps-VIE [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative liabilities, Not designated | (527) | [1] | (1,455) | [1]
Derivative Liabilities VIE [Member] | Interest Rate Swaps-VIE [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative liabilities, Not designated | (281) | [1] | (634) | [1]
Medium-Term Notes [Member] | Interest Rate Swaps-Embedded [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative assets, Not designated | 7 | [1] | 5 | [1]
Derivative liabilities, Not designated | (14) | [1] | (7) | [1]
Other Liabilities VIE [Member] | Interest Rate Swaps-Embedded-VIE [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative liabilities, Not designated |  |  | (1) | [1]
Derivative Liabilities Other Investments [Member] | All Other-Embedded [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative liabilities, Not designated | $ (12) | [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.

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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 Aggregate notional amount of all derivatives not designated as a hedging instrument. The notional amount relates to the total currency units, shares, bushels, pounds, or other units specified in a derivative instrument. + 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 Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959 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 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. + Details
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- Definition Aggregate notional amount of all derivatives. 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 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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