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)
Share-based compensation			(10)			$ 11
Net income (loss) attributable to MBIA Inc.	$ (93)			(93)
Other comprehensive income (loss)	62				62
Share-based compensation (in treasury stock shares)						111,803
Period change							(30)		7
Total equity balance at Mar. 31, 2023	$ (899)	$ 283	2,915	(746)	(221)	$ (3,143)	(912)		13
Balance (in treasury stock shares) at Mar. 31, 2023						(228,221,641)
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)
Share-based compensation			(29)			$ 31
Net income (loss) attributable to MBIA Inc.	$ (86)			(86)
Other comprehensive income (loss)	8				8
Share-based compensation (in treasury stock shares)						412,821
Period change							(76)		0
Total equity balance at Mar. 31, 2024	$ (1,723)	$ 283	$ 2,486	$ (1,230)	$ (131)	$ (3,141)	$ (1,733)		$ 10
Balance (in treasury stock shares) at Mar. 31, 2024	(231,910,363)					(231,910,363)
Balance (in common stock shares)	283,186,115	283,186,115
Balance (in preferred stock shares)	0							1,315