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Debt (Long-Term Debt) (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |
Accrued interest |  | $ 624 | $ 506
Debt issuance costs |  | (16) | (34)
Total |  | 2,121 | 1,986
6.400% Senior Notes Due 2022 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, gross | [1] | $ 265 | 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 | 46
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 | [2] | $ 21 | 21
Long-term debt, interest rate |  | 5.70% |
Long-term debt, maturity year |  | 2034 |
Surplus Notes Due 2033 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Surplus notes outstanding | [3] | $ 940 | $ 940
Long-term debt, maturity year |  | 2033 |
Callable date for fifth anniversary of initial callable date |  | Jan. 15, 2023 |
MBIA Inc Senior Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt, interest rate |  | 5.70% |
Long-term debt, maturity year |  | 2034 |
[1] | Callable on or after August 15, 2006 at par.
[2] | Callable anytime at the greater of par or the present value of the remaining scheduled payments of principal and interest.
[3] | Contractual interest rate is based on three month LIBOR plus 11.26%

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