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Debt (Narrative) (Detail) (USD $) | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  |  | 12 Months Ended
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Dec. 31, 2012 D | Dec. 31, 2011 | Jan. 16, 2008 14% Surplus Notes Due 2033 [Member] | Dec. 31, 2012 14% Surplus Notes Due 2033 [Member] | Dec. 31, 2011 14% Surplus Notes Due 2033 [Member] | Dec. 31, 2012 Investment Agreement Obligations [Member] | Dec. 31, 2011 Investment Agreement Obligations [Member] | Dec. 31, 2012 Medium-Term Notes [Member] | Dec. 31, 2011 Medium-Term Notes [Member] | Dec. 31, 2012 5.700% Senior Notes Due 2034 [Member] | Dec. 31, 2012 Cutwater-ISC [Member] Investment | Dec. 31, 2011 Cutwater-ISC [Member] | Dec. 31, 2012 Triple-A-One Funding, LLC [Member] | Dec. 31, 2012 Non Variable Interest Entities [Member] 14% Surplus Notes Due 2033 [Member] | Dec. 31, 2011 Non Variable Interest Entities [Member] 14% Surplus Notes Due 2033 [Member] | Dec. 31, 2012 Variable Interest Entity [Member] | Dec. 31, 2011 Variable Interest Entity [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount in excess of stated amount | $ 10,000,000 | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Surplus notes outstanding |  |  | 1,000,000,000 | 940,000,000 | [1] | 940,000,000 | [1] |  |  |  |  |  |  |  |  | 940,000,000 | 940,000,000 |  |
Long-term debt, interest rate |  |  | 14.00% | 14.00% |  |  |  |  |  |  |  | 5.70% |  |  |  |  |  |  |
Long-term debt, maturity date |  |  | Jan. 15, 2033 | Jan. 15, 2033 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate terms |  |  | Interest rate of 14% until January 15, 2013 and thereafter have an interest rate of three-month LIBOR plus 11.26% |  |  |  |  |  |  |  |  |  |  |  | One-month LIBOR plus 0.75% |  |  |  |
Debt Instrument, base reference rate |  |  | Three-month LIBOR |  |  |  |  |  |  |  |  |  |  |  | One-month LIBOR |  |  |  |
Debt Instrument, basis spread on variable rate |  |  | 11.26% |  |  |  |  |  |  |  |  |  |  |  | 0.75% |  |  |  |
Surplus notes purchased at par value | 13,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Surplus notes repurchased at outstanding par value | 47,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Surplus notes, weighted average price per unit | 77.08 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of senior notes | 172,000,000 |  |  |  |  |  |  |  |  |  |  | 172,000,000 |  |  |  |  |  |  |
Long-term debt, maturity year |  |  |  | 2033 |  |  |  |  |  |  |  | 2034 |  |  |  |  |  |  |
Weighted average price of senior notes |  |  |  |  |  |  |  |  |  |  |  | 100.17 |  |  |  |  |  |  |
Annual interest rates, minimum |  |  |  |  |  |  |  | 0.28% | 0.00% | 0.00% | 0.00% |  |  |  |  |  |  | 0.55% | 0.64%
Annual interest rates, maximum |  |  |  |  |  |  |  | 7.38% | 7.38% | 8.08% | 8.68% |  |  |  |  |  |  | 1.71% | 1.78%
Weighted average interest rate |  |  |  |  |  |  |  | 5.04% | 4.31% | 2.89% | 3.19% |  |  |  |  |  |  | 1.28% | 1.41%
Outstanding letters of credit |  |  |  |  |  |  |  |  |  |  |  |  | 1,600,000 |  |  |  |  |  |
Number of pooled investment programs |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |
Maximum amount of future payments under commitments |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,300,000,000 |  |  |  |  |
Triple-A One commercial paper maturity, days | 270 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Covering of the face amount of commercial paper outstanding, percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |
Repaid value in full and borrowings under liquidity facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 360,000,000 |  |  |  |
[1] | Callable on or after January 15, 2018 and every fifth anniversary thereafter at 100.00.

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