Consolidated Statements Of Changes In Shareholders' Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Deficit) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total Shareholders' Equity Of MBIA Inc. [Member]	Preferred Stock [Member]	Preferred Stock And Non Controlling Interest Held For Sale [Member]
Balance (in common stock shares)		283,186,115
Balance (in preferred stock shares)								1,315
Total equity balance at Dec. 31, 2022		$ 283	$ 2,925	$ (653)	$ (283)	$ (3,154)	$ (882)		$ 6
Balance (in treasury stock shares) at Dec. 31, 2022						(228,333,444)
Period change									(1)
Total equity balance at Mar. 31, 2023		283	2,915	(746)	(221)	$ (3,143)	(912)		13
Balance (in treasury stock shares) at Mar. 31, 2023						(228,221,641)
Total equity balance at Dec. 31, 2022		283	2,925	(653)	(283)	$ (3,154)	(882)		6
Balance (in treasury stock shares) at Dec. 31, 2022						(228,333,444)
Share-based compensation			(10)
Net income (loss) attributable to MBIA Inc.	$ (167)			(167)
Other comprehensive income (loss)	70				70
Treasury shares acquired under share repurchase program						$ (23)
Treasury shares acquired under share repurchase program (in shares)						(2,896,820)
Other						$ 12
Other (in shares)						87,064
Period change							(118)		6
Total equity balance at Jun. 30, 2023	(988)	$ 283	2,915	(820)	(213)	$ (3,165)	(1,000)		12
Balance (in treasury stock shares) at Jun. 30, 2023						(231,143,200)
Balance (in common stock shares)		283,186,115
Balance (in preferred stock shares)								1,315
Total equity balance at Mar. 31, 2023		$ 283	2,915	(746)	(221)	$ (3,143)	(912)		13
Balance (in treasury stock shares) at Mar. 31, 2023						(228,221,641)
Share-based compensation			0
Net income (loss) attributable to MBIA Inc.	(74)			(74)
Other comprehensive income (loss)	8				8
Treasury shares acquired under share repurchase program						$ (23)
Treasury shares acquired under share repurchase program (in shares)						(2,896,820)
Other						$ 1
Other (in shares)						(24,739)
Period change							(88)
Total equity balance at Jun. 30, 2023	$ (988)	$ 283	2,915	(820)	(213)	$ (3,165)	(1,000)		12
Balance (in treasury stock shares) at Jun. 30, 2023						(231,143,200)
Balance (in common stock shares)		283,186,115
Balance (in preferred stock shares)								1,315
Balance (in common stock shares)	283,186,115	283,186,115
Balance (in preferred stock shares)	0							1,315
Total equity balance at Dec. 31, 2023	$ (1,647)	$ 283	2,515	(1,144)	(139)	$ (3,172)	(1,657)		10
Balance (in treasury stock shares) at Dec. 31, 2023	(232,323,184)					(232,323,184)
Period change									(1)
Total equity balance at Mar. 31, 2024		283	2,486	(1,230)	(131)	$ (3,141)	(1,733)		10
Balance (in treasury stock shares) at Mar. 31, 2024						(231,910,363)
Total equity balance at Dec. 31, 2023	$ (1,647)	283	2,515	(1,144)	(139)	$ (3,172)	(1,657)		10
Balance (in treasury stock shares) at Dec. 31, 2023	(232,323,184)					(232,323,184)
Share-based compensation			(32)
Net income (loss) attributable to MBIA Inc.	$ (340)			(340)
Other comprehensive income (loss)	2				2
Treasury shares acquired under share repurchase program						$ 0
Treasury shares acquired under share repurchase program (in shares)						0
Other						$ 33
Other (in shares)						164,769
Period change							(337)		(1)
Total equity balance at Jun. 30, 2024	$ (1,985)	$ 283	2,483	(1,484)	(137)	$ (3,139)	(1,994)		9
Balance (in treasury stock shares) at Jun. 30, 2024	(232,158,415)					(232,158,415)
Balance (in common stock shares)		283,186,115
Balance (in preferred stock shares)								1,315
Total equity balance at Mar. 31, 2024		$ 283	2,486	(1,230)	(131)	$ (3,141)	(1,733)		10
Balance (in treasury stock shares) at Mar. 31, 2024						(231,910,363)
Share-based compensation			(3)
Net income (loss) attributable to MBIA Inc.	$ (254)			(254)
Other comprehensive income (loss)	(6)				(6)
Treasury shares acquired under share repurchase program						$ 0
Treasury shares acquired under share repurchase program (in shares)						0
Other						$ 2
Other (in shares)						(248,052)
Period change							(261)
Total equity balance at Jun. 30, 2024	$ (1,985)	$ 283	$ 2,483	$ (1,484)	$ (137)	$ (3,139)	$ (1,994)		$ 9
Balance (in treasury stock shares) at Jun. 30, 2024	(232,158,415)					(232,158,415)
Balance (in common stock shares)	283,186,115	283,186,115
Balance (in preferred stock shares)	0							1,315