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Investments (Securities Held In Unrealized Loss Position and Insured By Financial Guarantor and Related Insurance Loss Reserve On Company Insured Investments) (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012
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Schedule of Investments [Line Items] |  |
Total, Fair Value | $ 880 |
Total, Unrealized Losses | (139) |
Wrapped Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Total, Fair Value | 363 |
Total, Unrealized Losses | (101) |
Loss and loss adjustment expense reserves | 16 | [1]
Asset-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Total, Fair Value | 235 |
Total, Unrealized Losses | (90) |
Asset-Backed Securities [Member] | Wrapped Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Total, Fair Value | 157 |
Total, Unrealized Losses | (63) |
Loss and loss adjustment expense reserves | 16 | [1]
Asset-Backed Securities [Member] | Wrapped Securities [Member] | Other Insurers [Member] |  |
Schedule of Investments [Line Items] |  |
Total, Fair Value | 9 |
Total, Unrealized Losses | (5) |
Asset-Backed Securities [Member] | Wrapped Securities [Member] | MBIA Corp and National [Member] |  |
Schedule of Investments [Line Items] |  |
Total, Fair Value | 148 | [2]
Total, Unrealized Losses | (58) | [2]
Loss and loss adjustment expense reserves | 16 | [1],[2]
Mortgage-Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Total, Fair Value | 355 |
Total, Unrealized Losses | (23) |
Mortgage-Backed Securities [Member] | Wrapped Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Total, Fair Value | 117 |
Total, Unrealized Losses | (15) |
Mortgage-Backed Securities [Member] | Wrapped Securities [Member] | Other Insurers [Member] |  |
Schedule of Investments [Line Items] |  |
Total, Fair Value | 111 |
Total, Unrealized Losses | (15) |
Mortgage-Backed Securities [Member] | Wrapped Securities [Member] | MBIA Corp and National [Member] |  |
Schedule of Investments [Line Items] |  |
Total, Fair Value | 6 | [2]
Corporate Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Total, Fair Value | 290 |
Total, Unrealized Losses | (26) |
Corporate Obligations [Member] | Wrapped Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Total, Fair Value | 10 |
Total, Unrealized Losses | (11) |
Corporate Obligations [Member] | Wrapped Securities [Member] | Other Insurers [Member] |  |
Schedule of Investments [Line Items] |  |
Total, Fair Value | 10 |
Total, Unrealized Losses | (11) |
Other Investments [Member] | Wrapped Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Total, Fair Value | 79 |
Total, Unrealized Losses | (12) |
Other Investments [Member] | Wrapped Securities [Member] | Other Insurers [Member] |  |
Schedule of Investments [Line Items] |  |
Total, Fair Value | 8 |
Other Investments [Member] | Wrapped Securities [Member] | MBIA Corp and National [Member] |  |
Schedule of Investments [Line Items] |  |
Total, Fair Value | 71 | [2]
Total, Unrealized Losses | $ (12) | [2]
[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 Amount of the excess of amortized cost basis over fair value of securities in a loss position and 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 + 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 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 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 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. + 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 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 2: 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 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 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph a -Article 7 + Details
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