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Debt (Long-Term Debt) (Detail) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Jan. 16, 2008
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, gross |  | $ 582 |  | $ 592 |  |
Surplus notes outstanding |  | 940 | [1] | 940 | [1] | $ 1,000
Total |  | 1,908 |  | 1,810 |  |
6.400% Senior Notes Due 2022 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, gross | [2] | $ 266 |  | 266 |  |
Long-term debt, interest rate |  | 6.40% |  |  |  |
Long-term debt, maturity year |  | 2022 |  |  |  |
Initial Callable date |  | Aug. 15, 2006 |  |  |  |
7.000% Debentures Due 2025 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, gross |  | $ 46 |  | 56 |  |
Long-term debt, interest rate |  | 7.00% |  |  |  |
Long-term debt, maturity year |  | 2025 |  |  |  |
7.150% Debentures Due 2027 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, gross |  | $ 100 |  | 100 |  |
Long-term debt, interest rate |  | 7.15% |  |  |  |
Long-term debt, maturity year |  | 2027 |  |  |  |
6.625% Debentures Due 2028 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, gross |  | $ 141 |  | 141 |  |
Long-term debt, interest rate |  | 6.625% |  |  |  |
Long-term debt, maturity year |  | 2028 |  |  |  |
5.700% Senior Notes Due 2034 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, gross | [3] | $ 21 |  | 21 |  |
Long-term debt, interest rate |  | 5.70% |  |  |  |
Long-term debt, maturity year |  | 2034 |  |  |  |
14% Surplus Notes Due 2033 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Accrued interest |  | $ 386 |  | 278 |  |
Long-term debt, interest rate |  | 14.00% |  |  |  |
Long-term debt, maturity year |  | 2033 |  |  |  |
Callable date for fifth anniversary of initial callable date |  | Jan. 15, 2018 |  |  |  |
MBIA Inc Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Accrued interest |  | $ 8 |  | $ 8 |  |
[1] | Callable on or after January 15, 2018 and every fifth anniversary thereafter at 100.00.
[2] | Callable on or after August 15, 2006 at 100.00.
[3] | Callable anytime at the greater of 100.00 or the present value of the remaining scheduled payments of principal and interest.

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