Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Investments:
Assets held for sale	$ 74	$ 80
Total assets	2,990	3,375
Liabilities:
Liabilities held for sale	65	61
Total liabilities	4,218	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	2,919	2,925
Retained earnings (deficit)	(1,006)	(653)
Accumulated other comprehensive income (loss), net of tax of $7 and $8	(263)	(283)
Treasury stock, at cost--232,046,875 and 228,333,444 shares	(3,172)	(3,154)
Total shareholders' equity of MBIA Inc.	(1,239)	(882)
Preferred stock of subsidiary and noncontrolling interest held for sale	11	6
Total equity	(1,228)	(876)
Total liabilities and equity	2,990	3,375
Non Variable Interest Entity [Member]
Investments:
Fixed-maturity securities held as available-for-sale, at fair value (amortized cost $1,808 and $2,044)	1,555	1,812
Investments carried at fair value	346	511
Short-term investments, at fair value (amortized cost $444 and $353)	444	353
Other investments at amortized cost	3	0
Total investments	2,348	2,676
Cash and cash equivalents	70	50
Premiums receivable (net of allowance for credit losses $0 and $0)	151	160
Deferred acquisition costs	32	35
Insurance loss recoverable	177	137
Assets held for sale	74	80
Other assets	78	73
Liabilities:
Unearned premium revenue	240	266
Loss and loss adjustment expense reserves	450	439
Long-term debt	2,546	2,428
Medium-term notes (includes financial instruments carried at fair value of $37 and $41)	495	501
Investment agreements	225	233
Derivative liabilities	23	49
Liabilities held for sale	65	61
Other liabilities	82	94
Variable Interest Entity, Primary Beneficiary [Member]
Investments:
Investments carried at fair value	22	47
Other assets	2	23
Cash	4	16
Loans receivable at fair value	32	78
Liabilities:
Derivative liabilities	11	6
Variable interest entity debt (includes financial instruments carried at fair value of $78 and $172)	$ 81	$ 174