Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Investments:
Cash and cash equivalents	$ 160	$ 167
Premiums receivable (net of allowance for credit losses $5 and $5)	178	216
Total assets	4,696	5,751
Liabilities:
Total liabilities	4,996	5,602
Commitments and contingencies (Refer to Note 19)
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	2,931	2,962
Retained earnings (deficit)	(458)	(13)
Accumulated other comprehensive income (loss), net of tax of $8 and $8	100	115
Treasury stock, at cost—228,630,003 and 229,508,967 shares	(3,169)	(3,211)
Total shareholders' equity of MBIA Inc.	(313)	136
Preferred stock of subsidiary	13	13
Total equity	(300)	149
Total liabilities and equity	4,696	5,751
Non Variable Interest Entity [Member]
Investments:
Fixed-maturity securities held as available-for-sale, at fair value (amortized cost $2,016 and $2,078)	2,157	2,257
Investments carried at fair value	258	196
Investments pledged as collateral, at fair value (amortized cost $4 and $6)	4	1
Short-term investments, at fair value (amortized cost $374 and $281)	374	282
Total investments	2,793	2,736
Cash and cash equivalents	151	158
Premiums receivable (net of allowance for credit losses $5 and $5)	178	216
Deferred acquisition costs	42	50
Insurance loss recoverable	1,296	1,677
Other assets	67	84
Liabilities:
Unearned premium revenue	322	405
Loss and loss adjustment expense reserves	894	990
Long-term debt	2,331	2,229
Medium-term notes (includes financial instruments carried at fair value of $98 and $110)	590	710
Investment agreements	274	269
Derivative liabilities	131	215
Other liabilities	163	161
Variable Interest Entity Primary Beneficiary [Member]
Investments:
Investments carried at fair value	60	77
Other assets	23	20
Cash	9	9
Loans receivable at fair value	77	120
Loan repurchase commitments	0	604
Total assets	169	830
Liabilities:
Variable interest entity notes (includes financial instruments carried at fair value of $291 and $350)	291	623
Total liabilities	$ 291	$ 623