Consolidated Statements Of Operations - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Revenues:
Net realized investment gains (losses)		$ (3)	$ (3)
Net gains (losses) on financial instruments at fair value and foreign exchange		(13)	17
Total revenues		2	40
Expenses:
Losses and loss adjustment		6	49
Interest		51	41
Total expenses		85	113
Income (loss) from continuing operations before income taxes		(83)	(73)
Provision (benefit) for income taxes		0	0
Income (loss) from continuing operations		(83)	(73)
Income (loss) from discontinued operations, net of income taxes		(3)	0
Net income (loss)		(86)	(73)
Less: Net income (loss) from discontinued operations attributable to noncontrolling interests		7	0
Net income (loss) attributable to MBIA Inc.		$ (93)	$ (73)
Net income (loss) per common share attributable to MBIA Inc. - basic and diluted
Continuing operations - basic		$ (1.67)	$ (1.48)
Continuing operations - diluted		(1.67)	(1.48)
Discontinuing operations - basic		(0.19)	0
Discontinuing operations - diluted		(0.19)	0
Net income (loss) per common share attributable to MBIA Inc. - basic		(1.86)	(1.48)
Net income (loss) per common share attributable to MBIA Inc. - diluted		$ (1.86)	$ (1.48)
Weighted average number of common shares outstanding:
Basic	[1]	49,945,917	49,631,448
Diluted	[1]	49,945,917	49,631,448
Non Variable Interest Entity [Member]
Revenues:
Scheduled premiums earned		$ 10	$ 11
Refunding premiums earned		0	4
Premiums earned (net of ceded premiums of $- and $-)		10	15
Net investment income		26	18
Net realized investment gains (losses)		(3)	(3)
Net gains (losses) on financial instruments at fair value and foreign exchange		(13)	17
Other net realized gains (losses)		0	(3)
Expenses:
Losses and loss adjustment		6	49
Amortization of deferred acquisition costs		2	2
Operating		22	19
Interest		51	41
Variable Interest Entity Primary Beneficiary [Member]
Revenues:
Net gains (losses) on financial instruments at fair value and foreign exchange		(3)	(4)
Other net realized gains (losses)		(15)	0
Expenses:
Operating		$ 4	$ 2

[1] Includes 0.7 million and 0.9 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, 2023 and 2022, respectively.