Consolidated Statements Of Changes In Shareholders' Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [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	$ 2,931	$ (458)	$ 100	$ (3,169)	$ (313)		$ 13
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.	$ (109)			(109)
Other comprehensive income (loss)	(331)				(331)
Treasury shares acquired under share repurchase program						$ 0
Treasury shares acquired under share repurchase program (in shares)						0
Other						$ 17
Others (in shares)						343,604
Period change			(12)				(435)		0
Total equity balance at Jun. 30, 2022	(735)		2,919	(567)	(231)	$ (3,152)	(748)		13
Balance (in treasury stock shares) at Jun. 30, 2022						(228,286,399)
Balance (in preferred stock shares) at Jun. 30, 2022								1,315
Total equity balance at Mar. 31, 2022		$ 283	2,919	(531)	(82)	$ (3,154)	(565)		13
Balance (in common stock shares) at Mar. 31, 2022		283,186,115
Balance (in treasury stock shares) at Mar. 31, 2022						(228,329,115)
Net income (loss) attributable to MBIA Inc.	(36)			(36)
Other comprehensive income (loss)	(149)				(149)
Treasury shares acquired under share repurchase program						$ 0
Treasury shares acquired under share repurchase program (in shares)						0
Other						$ 2
Others (in shares)						42,716
Period change			0				(183)		0
Total equity balance at Jun. 30, 2022	(735)		2,919	(567)	(231)	$ (3,152)	(748)		13
Balance (in treasury stock shares) at Jun. 30, 2022						(228,286,399)
Balance (in preferred stock shares) at Jun. 30, 2022								1,315
Total equity balance at Dec. 31, 2022	$ (876)	$ 283	2,925	(653)	(283)	$ (3,154)	(882)		6
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.	$ (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
Others (in shares)						87,064
Period change			(10)				(118)		6
Total equity balance at Jun. 30, 2023	$ (988)		2,915	(820)	(213)	$ (3,165)	(1,000)		12
Balance (in treasury stock shares) at Jun. 30, 2023	(231,143,200)					(231,143,200)
Balance (in preferred stock shares) at Jun. 30, 2023	0							1,315
Total equity balance at Mar. 31, 2023		$ 283	2,915	(746)	(221)	$ (3,143)	(912)		13
Balance (in common stock shares) at Mar. 31, 2023		283,186,115
Balance (in treasury stock shares) at Mar. 31, 2023						(228,221,641)
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
Others (in shares)						(24,739)
Period change			0				(88)		(1)
Total equity balance at Jun. 30, 2023	$ (988)		$ 2,915	$ (820)	$ (213)	$ (3,165)	$ (1,000)		$ 12
Balance (in treasury stock shares) at Jun. 30, 2023	(231,143,200)					(231,143,200)
Balance (in preferred stock shares) at Jun. 30, 2023	0							1,315