Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statements of Comprehensive Income (Loss)
Net income (loss) attributable to MBIA Inc.	$ (185)	$ (34)	$ (353)	$ (143)
Available-for-sale securities with no credit losses:
Unrealized gains (losses) arising during the period	(65)	(102)	(37)	(399)
Reclassification adjustments for (gains) losses included in net income (loss)	3	(3)	16	(5)
Available-for-sale securities with credit losses:
Unrealized gains (losses) arising during the period	0	1	0	0
Foreign currency translation:
Foreign currency translation gains (losses)	0	0	0	1
Instrument-specific credit risk of liabilities measured at fair value:
Unrealized gains (losses) arising during the period	1	(2)	(4)	(22)
Reclassification adjustments for (gains) losses included in net income (loss)	11	23	45	11
Total other comprehensive income (loss)	(50)	(83)	20	(414)
Comprehensive income (loss) attributable to MBIA Inc.	$ (235)	$ (117)	$ (333)	$ (557)