Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statements of Comprehensive Income (Loss)
Net income (loss) attributable to MBIA Inc.	$ (74)	$ (36)	$ (167)	$ (109)
Available-for-sale securities with no credit losses:
Unrealized gains (losses) arising during the period	(15)	(126)	28	(297)
Reclassification adjustments for (gains) losses included in net income (loss)	8	(2)	13	(2)
Available-for-sale securities with credit losses:
Unrealized gains (losses) arising during the period	0	(1)	0	(1)
Foreign currency translation:
Foreign currency translation gains (losses)	1	1	0	1
Instrument-specific credit risk of liabilities measured at fair value:
Unrealized gains (losses) arising during the period	(6)	(6)	(5)	(20)
Reclassification adjustments for (gains) losses included in net income (loss)	20	(15)	34	(12)
Total other comprehensive income (loss)	8	(149)	70	(331)
Comprehensive income (loss) attributable to MBIA Inc.	$ (66)	$ (185)	$ (97)	$ (440)