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Investments (Securities Held In Unrealized Loss Position And Insured By Financial Guarantor) (Detail) (USD $) In Millions, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Schedule Of Investments [Line Items] |  |  |
Total Available-For-Sale, Fair Value | $ 2,893 |  | $ 1,284
Unrealized Loss | (195) |  | (152)
Wrapped Securities [Member] |  |  |
Schedule Of Investments [Line Items] |  |  |
Total Available-For-Sale, Fair Value | 299 |  |
Unrealized Loss | (74) |  |
Loss and loss adjustment expense reserves | 15 | [1] |
Asset-backed [Member] |  |  |
Schedule Of Investments [Line Items] |  |  |
Total Available-For-Sale, Fair Value | 223 |  |
Unrealized Loss | (78) |  |
Asset-backed [Member] | Wrapped Securities [Member] |  |  |
Schedule Of Investments [Line Items] |  |  |
Total Available-For-Sale, Fair Value | 162 |  |
Unrealized Loss | (60) |  |
Loss and loss adjustment expense reserves | 15 | [1] |
Asset-backed [Member] | Wrapped Securities [Member] | Mbia Corp And National [Member] |  |  |
Schedule Of Investments [Line Items] |  |  |
Total Available-For-Sale, Fair Value | 151 | [2] |
Unrealized Loss | (56) | [2] |
Loss and loss adjustment expense reserves | 15 | [1],[2] |
Asset-backed [Member] | Wrapped Securities [Member] | Other Insurers [Member] |  |  |
Schedule Of Investments [Line Items] |  |  |
Total Available-For-Sale, Fair Value | 11 |  |
Unrealized Loss | (4) |  |
Loss and loss adjustment expense reserves | 0 | [1] |
Mortgage-backed [Member] |  |  |
Schedule Of Investments [Line Items] |  |  |
Total Available-For-Sale, Fair Value | 639 |  |
Unrealized Loss | (28) |  |
Mortgage-backed [Member] | Wrapped Securities [Member] |  |  |
Schedule Of Investments [Line Items] |  |  |
Total Available-For-Sale, Fair Value | 17 |  |
Unrealized Loss | (1) |  |
Loss and loss adjustment expense reserves | 0 | [1] |
Mortgage-backed [Member] | Wrapped Securities [Member] | Mbia Corp And National [Member] |  |  |
Schedule Of Investments [Line Items] |  |  |
Total Available-For-Sale, Fair Value | 2 | [2] |
Unrealized Loss | 0 | [2] |
Loss and loss adjustment expense reserves | 0 | [1],[2] |
Mortgage-backed [Member] | Wrapped Securities [Member] | Other Insurers [Member] |  |  |
Schedule Of Investments [Line Items] |  |  |
Total Available-For-Sale, Fair Value | 15 |  |
Unrealized Loss | (1) |  |
Loss and loss adjustment expense reserves | 0 | [1] |
Corporate Obligations [Member] |  |  |
Schedule Of Investments [Line Items] |  |  |
Total Available-For-Sale, Fair Value | 566 |  |
Unrealized Loss | (38) |  |
Corporate Obligations [Member] | Wrapped Securities [Member] |  |  |
Schedule Of Investments [Line Items] |  |  |
Total Available-For-Sale, Fair Value | 11 |  |
Unrealized Loss | (9) |  |
Loss and loss adjustment expense reserves | 0 | [1] |
Corporate Obligations [Member] | Wrapped Securities [Member] | Mbia Corp And National [Member] |  |  |
Schedule Of Investments [Line Items] |  |  |
Total Available-For-Sale, Fair Value | 0 | [2] |
Unrealized Loss | 0 | [2] |
Loss and loss adjustment expense reserves | 0 | [1],[2] |
Corporate Obligations [Member] | Wrapped Securities [Member] | Other Insurers [Member] |  |  |
Schedule Of Investments [Line Items] |  |  |
Total Available-For-Sale, Fair Value | 11 |  |
Unrealized Loss | (9) |  |
Loss and loss adjustment expense reserves | 0 | [1] |
All Other Securities [Member] | Wrapped Securities [Member] |  |  |
Schedule Of Investments [Line Items] |  |  |
Total Available-For-Sale, Fair Value | 109 |  |
Unrealized Loss | (4) |  |
Loss and loss adjustment expense reserves | 0 | [1] |
All Other Securities [Member] | Wrapped Securities [Member] | Mbia Corp And National [Member] |  |  |
Schedule Of Investments [Line Items] |  |  |
Total Available-For-Sale, Fair Value | 97 | [2] |
Unrealized Loss | (4) | [2] |
Loss and loss adjustment expense reserves | 0 | [1],[2] |
All Other Securities [Member] | Wrapped Securities [Member] | Other Insurers [Member] |  |  |
Schedule Of Investments [Line Items] |  |  |
Total Available-For-Sale, Fair Value | 12 |  |
Unrealized Loss | 0 |  |
Loss and loss adjustment expense reserves | $ 0 | [1] |
[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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