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Investments (Securities Held In Unrealized Loss Position And Insured By Financial Guarantor And The Related Insurance Loss Reserve On Company Insured Investments) (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
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Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total, Fair Value | $ 2,092 |  | $ 2,387
Total, Unrealized Losses | (278) |  | (478)
Mortgage-Backed Securities [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total, Fair Value | 360 |  |
Total, Unrealized Losses | (91) |  |
Asset-Backed Securities [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total, Fair Value | 330 |  |
Total, Unrealized Losses | 125 |  |
Corporate Obligations [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total, Fair Value | 495 |  |
Total, Unrealized Losses | (37) |  |
Wrapped Securities [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total, Fair Value | 618 |  |
Total, Unrealized Losses | (183) |  |
Loss and Loss Adjustment Expense Reserves | 16 | [1] |
Wrapped Securities [Member] | All Other [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total, Fair Value | 142 |  |
Total, Unrealized Losses | (19) |  |
Wrapped Securities [Member] | Mortgage-Backed Securities [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total, Fair Value | 241 |  |
Total, Unrealized Losses | (77) |  |
Wrapped Securities [Member] | Mortgage-Backed Securities [Member] | MBIA [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total, Fair Value | 11 | [2] |
Total, Unrealized Losses | (1) | [2] |
Wrapped Securities [Member] | Mortgage-Backed Securities [Member] | All Other [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total, Fair Value | 230 |  |
Total, Unrealized Losses | (76) |  |
Wrapped Securities [Member] | Asset-Backed Securities [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total, Fair Value | 207 |  |
Total, Unrealized Losses | (76) |  |
Loss and Loss Adjustment Expense Reserves | 16 | [1] |
Wrapped Securities [Member] | Asset-Backed Securities [Member] | MBIA [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total, Fair Value | 149 | [2] |
Total, Unrealized Losses | (64) | [2] |
Loss and Loss Adjustment Expense Reserves | 16 | [1],[2] |
Wrapped Securities [Member] | Asset-Backed Securities [Member] | All Other [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total, Fair Value | 58 |  |
Total, Unrealized Losses | (12) |  |
Wrapped Securities [Member] | Corporate Obligations [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total, Fair Value | 28 |  |
Total, Unrealized Losses | (11) |  |
Wrapped Securities [Member] | Corporate Obligations [Member] | MBIA [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total, Fair Value | 4 | [2] |
Wrapped Securities [Member] | Corporate Obligations [Member] | All Other [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total, Fair Value | 24 |  |
Total, Unrealized Losses | (11) |  |
Wrapped Securities [Member] | All Other [Member] | MBIA [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total, Fair Value | 134 | [2] |
Total, Unrealized Losses | (19) | [2] |
Wrapped Securities [Member] | All Other [Member] | All Other [Member] |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |
Total, Fair Value | $ 8 |  |
[1] | Insurance loss reserve estimates are based on the proportion of par value owned to the total amount of par value insured.
[2] | Includes investments insured by MBIA Corp. and National.

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- Definition This item represents the excess of amortized cost basis over fair value of securities in a loss position and which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a -Clause 2 -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 FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a -Clause 2 -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 This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a(2) -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 FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 + Details
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- Definition Alternate concept name for the aggregate amount of policy reserves (provided for future obligations including unpaid claims and claims adjustment expenses) and policy benefits (liability for future policy benefits) as of the balance sheet date; grouped amount of all the liabilities associated with the company's insurance policies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.13(a)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9 -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 AICPA -Name Statement of Position (SOP) -Number 94-5 -Paragraph 11 -Subparagraph a -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 13 -Subparagraph a + Details
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