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Insurance In Force (Summary Of The Company's Reinsurance Agreements For U.S. Public Finance And Structured Finance And International Insurance Operations) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Ceded Par Outstanding | $ 4,269 |  | $ 5,700
LOC / Trust Accounts | 7 |  |
Reinsurance Recoverables | 16 | [1] |
Reinsurance recoverables on paid losses | 1 |  |
Reinsurance recoverables on unpaid losses | 15 |  |
Moody's Aa3 [Member] | Assured Guaranty Corp [Member] | S&P AA+ [Member] |  |  |
Ceded Par Outstanding | 3,235 |  |
LOC / Trust Accounts |  |  |
Reinsurance Recoverables | 16 | [1] |
A [Member] | Assured Guaranty Re Ltd [Member] | S&P AA [Member] |  |  |
Ceded Par Outstanding | 542 |  |
LOC / Trust Accounts | 5 |  |
Reinsurance Recoverables | 0 | [1] |
Aaa [Member] | Overseas Private Investment Corporation [Member] | S&P AAA [Member] |  |  |
Ceded Par Outstanding | 320 |  |
LOC / Trust Accounts |  |  |
Aaa [Member] | Export Development Canada [Member] | S&P AAA [Member] |  |  |
Ceded Par Outstanding | 77 |  |
LOC / Trust Accounts | 1 |  |
Moody's A1 Or Above [Member] | Others [Member] | S&P A+ Or Above [Member] |  |  |
Ceded Par Outstanding | 95 |  |
LOC / Trust Accounts | 1 |  |
Reinsurance Recoverables | $ 0 | [1] |
[1] | reinsurance recoverable of $16 million comprised recoverables on paid and unpaid losses of $1 million and $15 million, respectively.

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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The known and estimated amount recoverable as of the balance sheet date from reinsurers for claims paid or incurred by the ceding insurer and associated claims settlement expenses, including estimated amounts for claims incurred but not reported, and policy benefits, net of any related valuation allowance. + 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.(a),6) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 7 -Section 03 -Paragraph 6 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 113 -Paragraph 14, 16, 27, 113 -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 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6824-158387 + Details
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