Consolidated Statements Of Operations - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Premiums earned:
Net realized investment gains (losses)		$ (41)	$ 5	$ 48
Net gains (losses) on financial instruments at fair value and foreign exchange		45	40	(80)
Net gains (losses) on extinguishment of debt		4	30
Total revenues		154	189	282
Expenses:
Losses and loss adjustment		38	350	530
Interest		179	163	178
Total expenses		302	634	860
Income (loss) from continuing operations before income taxes		(148)	(445)	(578)
Provision (benefit) for income taxes		1	0	0
Income (loss) from continuing operations		(149)	(445)	(578)
Income (loss) from discontinued operations, net of income taxes		(54)	0	0
Net income (loss)		(203)	(445)	(578)
Less: Net income (loss) from discontinued operations attributable to noncontrolling interests		(8)	0	0
Net income (loss) attributable to MBIA Inc.		$ (195)	$ (445)	$ (578)
Net income (loss) per common share attributable to MBIA Inc.—basic and diluted
Continuing operations - basic		$ (3)	$ (8.99)	$ (9.78)
Continuing operations - diluted		(3)	(8.99)	(9.78)
Discontinuing operations - basic		(0.92)	0	0
Discontinuing operations - diluted		(0.92)	0	0
Net income (loss) per common share attributable to MBIA Inc. - basic		(3.92)	(8.99)	(9.78)
Net income (loss) per common share attributable to MBIA Inc. - diluted		$ (3.92)	$ (8.99)	$ (9.78)
Weighted average number of common shares outstanding:
Basic	[1]	49,803,739	49,472,281	59,071,843
Diluted	[1]	49,803,739	49,472,281	59,071,843
Non Variable Interest Entity [Member]
Premiums earned:
Scheduled premiums earned		$ 39	$ 64	$ 59
Refunding premiums earned		14	10	14
Premiums earned (net of ceded premiums of $1, $16 and $5)		53	74	73
Net investment income		95	62	76
Net realized investment gains (losses)		(41)	5	48
Net gains (losses) on financial instruments at fair value and foreign exchange		45	40	(80)
Net gains (losses) on extinguishment of debt		4	30	0
Fees and reimbursements		5	7	2
Other net realized gains (losses)		(12)	(6)	0
Expenses:
Losses and loss adjustment		38	350	530
Amortization of deferred acquisition costs		8	6	10
Operating		68	91	87
Interest		179	163	178
Variable Interest Entity Primary Beneficiary [Member]
Premiums earned:
Net investment income		0	0	18
Net gains (losses) on financial instruments at fair value and foreign exchange		(14)	(8)	108
Other net realized gains (losses)		19	(15)	37
Expenses:
Operating		8	6	5
Interest		$ 1	$ 18	$ 50

[1] Includes 0.8 million, 0.9 million and 0.9 million of participating securities that met the service condition and were eligible to receive nonforfeitable dividends or dividend equivalents for each of the years ended December 31, 2022, 2021 and 2020, respectively.