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Debt (Narrative) (Detail) - USD ($)		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Aggregate unpaid contractual principal		$ 2,741,000,000	$ 2,585,000,000
Debt instrument principal amount repurchased		$ 308,000,000
Mbia Inc Debentures [Member]
Debt Instrument [Line Items]
Debt instrument interest rate		7.00%
Long-term debt, maturity year		2025
Litigation Trust [Member]
Debt Instrument [Line Items]
Debt instrument interest rate		18.00%
Long-term debt, maturity date		Aug. 02, 2027
Unused Commitment		$ 0
MBIA Inc. Senior Notes [Member]
Debt Instrument [Line Items]
Debt instrument interest rate		5.70%
Long-term debt, maturity year		2034
MBIA Corp Surplus Notes [Member]
Debt Instrument [Line Items]
Callable date for fifth anniversary of initial callable date		Jan. 15, 2028
MBIA Corp Surplus Notes [Member] | Mbia Inc Debentures [Member]
Debt Instrument [Line Items]
Debt instrument principal amount repurchased		$ 13,000,000
6.625% Debentures Due 2028 [Member]
Debt Instrument [Line Items]
Debt instrument interest rate		6.625%
Long-term debt, maturity year		2028
Aggregate unpaid contractual principal		$ 112,000,000	$ 112,000,000
6.625% Debentures Due 2028 [Member] | Mbia Inc Debentures [Member]
Debt Instrument [Line Items]
Debt instrument interest rate			6.625%
Long-term debt, maturity year			2028
7.150% Debentures Due 2027 [Member]
Debt Instrument [Line Items]
Debt instrument interest rate		7.15%
Long-term debt, maturity year		2027
Aggregate unpaid contractual principal		$ 95,000,000	$ 96,000,000
7.150% Debentures Due 2027 [Member] | Mbia Inc Debentures [Member]
Debt Instrument [Line Items]
Debt instrument interest rate		7.15%
Long-term debt, maturity year		2027
Third Party Loan [Member] | Litigation Trust [Member]
Debt Instrument [Line Items]
Aggregate unpaid contractual principal		$ 12,000,000	3,000,000
7.000% Debentures Due 2025 [Member]
Debt Instrument [Line Items]
Debt instrument interest rate		7.00%
Long-term debt, maturity year		2025
Aggregate unpaid contractual principal		$ 45,000,000	45,000,000
7.000% Debentures Due 2025 [Member] | Mbia Inc Debentures [Member]
Debt Instrument [Line Items]
Debt instrument interest rate		7.00%
Long-term debt, maturity year		2025
5.700% Senior Notes Due 2034 [Member]
Debt Instrument [Line Items]
Debt instrument interest rate		5.70%
Long-term debt, maturity year		2034
Aggregate unpaid contractual principal	[1]	$ 21,000,000	$ 21,000,000
Medium-term Notes [Member]
Debt Instrument [Line Items]
Weighted average interest rate		5.17%	4.76%
Medium-term Notes [Member] | Floating Rate [Member]
Debt Instrument [Line Items]
Debt instrument interest rate		0.00%
Investment Agreement Obligations [Member]
Debt Instrument [Line Items]
Weighted average interest rate		6.01%	6.06%
Maximum [Member] | Medium-term Notes [Member]
Debt Instrument [Line Items]
Debt instrument interest rate		5.90%	5.90%
Maximum [Member] | Investment Agreement Obligations [Member]
Debt Instrument [Line Items]
Debt instrument interest rate			6.88%
Minimum [Member] | Medium-term Notes [Member]
Debt Instrument [Line Items]
Debt instrument interest rate		2.50%	2.21%
Minimum [Member] | Investment Agreement Obligations [Member]
Debt Instrument [Line Items]
Debt instrument interest rate		4.78%	4.78%
MBIA Inc. [Member] | MBIA Corp Surplus Notes [Member]
Debt Instrument [Line Items]
Long-term debt principal amount previously purchased			$ 13,000,000
National [Member] | 7.000% Debentures Due 2025 [Member]
Debt Instrument [Line Items]
Debt instrument principal amount repurchased		$ 10,000,000
National [Member] | 5.700% Senior Notes Due 2034 [Member]
Debt Instrument [Line Items]
Long-term debt principal amount previously purchased		308,000,000
Mbia Corp [Member] | 6.625% Debentures Due 2028 [Member] | Mbia Inc Debentures [Member]
Debt Instrument [Line Items]
Long-term debt principal amount previously purchased			29,000,000
Mbia Corp [Member] | 7.150% Debentures Due 2027 [Member]
Debt Instrument [Line Items]
Debt instrument principal amount repurchased		5,000,000
Mbia Corp [Member] | 7.000% Debentures Due 2025 [Member]
Debt Instrument [Line Items]
Debt instrument principal amount repurchased		1,000,000
Variable Interest Entity Primary Beneficiary [Member]
Debt Instrument [Line Items]
Aggregate unpaid contractual principal		45,000,000	328,000,000
MBIA Insured Variable Interest Entity Primary Beneficiary [Member]
Debt Instrument [Line Items]
Aggregate unpaid contractual principal		$ 36,000,000	$ 96,000,000
[1] Callable anytime at the greater of par or the present value of the remaining scheduled payments of principal and interest.

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