Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Investments:
Assets held for sale	$ 88	$ 80
Total assets	3,257	3,375
Liabilities:
Liabilities held for sale	70	61
Total liabilities	4,245	4,251
Commitments and contingencies (Refer to Note 13: Commitments and Contingencies)
Equity:
Preferred stock, par value $1 per share; authorized shares—10,000,000; issued and outstanding—none	0	0
Common stock, par value $1 per share; authorized shares—400,000,000; issued shares—283,186,115 and 283,186,115	283	283
Additional paid-in capital	2,915	2,925
Retained earnings (deficit)	(820)	(653)
Accumulated other comprehensive income (loss), net of tax of $7 and $8	(213)	(283)
Treasury stock, at cost—231,143,200 and 228,333,444 shares	(3,165)	(3,154)
Total shareholders' equity of MBIA Inc.	(1,000)	(882)
Preferred stock of subsidiary and noncontrolling interest held for sale	12	6
Total equity	(988)	(876)
Total liabilities and equity	3,257	3,375
Non Variable Interest Entity [Member]
Investments:
Fixed-maturity securities held as available-for-sale, at fair value (amortized cost $1,914 and $2,044)	1,725	1,812
Investments carried at fair value	346	511
Short-term investments, at fair value (amortized cost $374 and $353)	374	353
Total investments	2,445	2,676
Cash and cash equivalents	208	50
Premiums receivable (net of allowance for credit losses $0 and $0)	155	160
Deferred acquisition costs	33	35
Insurance loss recoverable	100	137
Assets held for sale	88	80
Other assets	65	73
Liabilities:
Unearned premium revenue	249	266
Loss and loss adjustment expense reserves	361	439
Long-term debt	2,505	2,428
Medium-term notes (includes financial instruments carried at fair value of $38 and $41)	494	501
Investment agreements	236	233
Derivative liabilities	48	49
Liabilities held for sale	70	61
Other liabilities	84	94
Variable Interest Entity Primary Beneficiary [Member]
Investments:
Investments carried at fair value	22	47
Other assets	64	23
Cash	7	16
Loans receivable at fair value	70	78
Liabilities:
Derivative liabilities	12	6
Variable interest entity debt (includes financial instruments carried at fair value of $183 and $172)	$ 186	$ 174