Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Investments:
Assets held for sale	$ 83	$ 80
Total assets	3,317	3,375
Liabilities:
Liabilities held for sale	68	61
Total liabilities	4,216	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)	(746)	(653)
Accumulated other comprehensive income (loss), net of tax of $7 and $8	(221)	(283)
Treasury stock, at cost—228,221,641 and 228,333,444 shares	(3,143)	(3,154)
Total shareholders' equity of MBIA Inc.	(912)	(882)
Preferred stock of subsidiary and noncontrolling interest held for sale	13	6
Total equity	(899)	(876)
Total liabilities and equity	3,317	3,375
Non Variable Interest Entity [Member]
Investments:
Fixed-maturity securities held as available-for-sale, at fair value (amortized cost $2,141 and $2,044)	1,957	1,812
Investments carried at fair value	355	511
Short-term investments, at fair value (amortized cost $367 and $353)	368	353
Total investments	2,680	2,676
Cash and cash equivalents	67	50
Premiums receivable (net of allowance for credit losses $0 and $0)	160	160
Deferred acquisition costs	35	35
Insurance loss recoverable	95	137
Assets held for sale	83	80
Other assets	67	73
Liabilities:
Unearned premium revenue	257	266
Loss and loss adjustment expense reserves	379	439
Long-term debt	2,467	2,428
Medium-term notes (includes financial instruments carried at fair value of $42 and $41)	507	501
Investment agreements	233	233
Derivative liabilities	57	49
Liabilities held for sale	68	61
Other liabilities	81	94
Variable Interest Entity Primary Beneficiary [Member]
Investments:
Investments carried at fair value	22	47
Other assets	9	23
Cash	16	16
Loans receivable at fair value	83	78
Liabilities:
Derivative liabilities	11	6
Variable interest entity debt (includes financial instruments carried at fair value of $154 and $172)	$ 156	$ 174