Consolidated Statements Of Changes In Shareholders' Equity - USD ($)	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]
Total equity balance at Dec. 31, 2021		$ 283,000,000	$ 2,931,000,000	$ (458,000,000)	$ 100,000,000	$ (3,169,000,000)	$ (313,000,000)		$ 13,000,000
Balance (in common stock shares) at Dec. 31, 2021		283,186,115
Balance (in treasury stock shares) at Dec. 31, 2021						(228,630,003)
Net income (loss) attributable to MBIA Inc.	$ (73,000,000)			(73,000,000)
Other comprehensive income (loss)	(182,000,000)				(182,000,000)
Share-based compensation (in shares)						300,888
Share-based compensation						$ 15,000,000
Period change			(12,000,000)				(252,000,000)		0
Total equity balance at Mar. 31, 2022	(552,000,000)		2,919,000,000	(531,000,000)	(82,000,000)	$ (3,154,000,000)	(565,000,000)		13,000,000
Balance (in treasury stock shares) at Mar. 31, 2022						(228,329,115)
Balance (in preferred stock shares) at Mar. 31, 2022								1,315
Total equity balance at Dec. 31, 2022	$ (876,000,000)	$ 283,000,000	2,925,000,000	(653,000,000)	(283,000,000)	$ (3,154,000,000)	(882,000,000)		6,000,000
Balance (in common stock shares) at Dec. 31, 2022	283,186,115	283,186,115
Balance (in treasury stock shares) at Dec. 31, 2022	(228,333,444)					(228,333,444)
Net income (loss) attributable to MBIA Inc.	$ (93,000,000)			(93,000,000)
Other comprehensive income (loss)	62,000,000				62,000,000
Share-based compensation (in shares)						111,803
Share-based compensation						$ 11,000,000
Period change			(10,000,000)				(30,000,000)		7,000,000
Total equity balance at Mar. 31, 2023	$ (899,000,000)		$ 2,915,000,000	$ (746,000,000)	$ (221,000,000)	$ (3,143,000,000)	$ (912,000,000)		$ 13,000,000
Balance (in treasury stock shares) at Mar. 31, 2023	(228,221,641)					(228,221,641)
Balance (in preferred stock shares) at Mar. 31, 2023	0							1,315