Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Investments:
Assets held for sale	$ 74	$ 73
Total assets	2,488	2,606
Liabilities:
Liabilities held for sale	64	64
Total liabilities	4,211	4,253
Commitments and contingencies (Refer to Note 12: 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	2,486	2,515
Retained earnings (deficit)	(1,230)	(1,144)
Accumulated other comprehensive income (loss), net of tax of $7 and $7	(131)	(139)
Treasury stock, at cost--231,910,363 and 232,323,184 shares	(3,141)	(3,172)
Total shareholders' equity of MBIA Inc.	(1,733)	(1,657)
Preferred stock of subsidiary and noncontrolling interest held for sale	10	10
Total equity	(1,723)	(1,647)
Total liabilities and equity	2,488	2,606
Non Variable Interest Entity [Member]
Investments:
Fixed-maturity securities held as available-for-sale, at fair value (amortized cost $1,186 and $1,175)	1,040	1,043
Investments carried at fair value	321	337
Short-term investments, at fair value (amortized cost $442 and $548)	442	548
Other investments at amortized cost	3	3
Total investments	1,806	1,931
Cash and cash equivalents	131	104
Premiums receivable (net of allowance for credit losses $- and $-)	145	146
Deferred acquisition costs	30	31
Insurance loss recoverable	179	183
Assets held for sale	74	73
Other assets	57	76
Liabilities:
Unearned premium revenue	224	232
Loss and loss adjustment expense reserves	470	473
Long-term debt	2,625	2,585
Medium-term notes (includes financial instruments carried at fair value of $36 and $40)	457	497
Investment agreements	220	221
Liabilities held for sale	64	64
Other liabilities	85	86
Variable Interest Entity, Primary Beneficiary [Member]
Investments:
Investments carried at fair value	22	22
Other assets	2	2
Cash	6	3
Loans receivable at fair value	36	35
Liabilities:
Variable interest entity debt (includes financial instruments carried at fair value of $46 and $78)	51	81
Derivative liabilities	$ 15	$ 14