Consolidated Statements Of Operations - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Revenues:
Net realized investment gains (losses)		$ (1)	$ (3)
Net gains (losses) on financial instruments at fair value and foreign exchange		4	(13)
Net gains (losses) on extinguishment of debt		1	0
Total revenues		13	2
Expenses:
Losses and loss adjustment		18	6
Interest		52	51
Total expenses		100	85
Income (loss) from continuing operations before income taxes		(87)	(83)
Provision (benefit) for income taxes		0	0
Income (loss) from continuing operations		(87)	(83)
Income (loss) from discontinued operations, net of income taxes		1	(3)
Net income (loss)		(86)	(86)
Less: Net income from discontinued operations attributable to noncontrolling interest		0	7
Net income (loss) attributable to MBIA Inc.		$ (86)	$ (93)
Net income (loss) per common share attributable to MBIA Inc. - basic and diluted
Continuing operations - basic		$ (1.88)	$ (1.67)
Continuing operations - diluted		(1.88)	(1.67)
Discontinued operations - basic		0.04	(0.19)
Discontinued operations - diluted		0.04	(0.19)
Net income (loss) per common share attributable to MBIA Inc. - basic		(1.84)	(1.86)
Net income (loss) per common share attributable to MBIA Inc. - diluted		$ (1.84)	$ (1.86)
Weighted average number of common shares outstanding:
Basic	[1]	46,820,922	49,945,917
Diluted	[1]	46,820,922	49,945,917
Non Variable Interest Entity [Member]
Revenues:
Total premiums earned (net of ceded premiums of $- and $-)		$ 9	$ 10
Net investment income		23	26
Net realized investment gains (losses)		(1)	(3)
Net gains (losses) on financial instruments at fair value and foreign exchange		4	(13)
Other net realized gains (losses)		2	0
Expenses:
Losses and loss adjustment		18	6
Amortization of deferred acquisition costs		1	2
Operating		25	22
Interest		52	51
Variable Interest Entity, Primary Beneficiary [Member]
Revenues:
Net gains (losses) on financial instruments at fair value and foreign exchange		(25)	(3)
Other net realized gains (losses)		0	(15)
Expenses:
Operating		$ 4	$ 4

[1] Includes approximately 1 million of participating securities that met the service condition and were eligible to receive nonforfeitable dividends or dividend equivalents for the three months ended March 31, 2024 and 2023.