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Common and Preferred Stock (Narrative) (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2020 | Dec. 31, 2021
Class of Stock [Line Items] |  |  |
Preferred stock shares issued | 0 |  | 0
Preferred stock shares outstanding | 0 |  | 0
Preferred stock par or stated value per share | $ 1 |  | $ 1
Treasury stock shares acquired |  | 26,400,000 |
Treasury stock acquired cost |  | $ 198 |
MBIA Insurance Corporation [Member] |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock par or stated value per share | 1,000 |  |
Preferred stock liquidation preference | 100,000 |  |
Preferred Stock [Member] | MBIA Insurance Corporation [Member] |  |  |
Class of Stock [Line Items] |  |  |
Shares repurchased under share repurchase program, average price per share | $ 10,900 |  |
Preferred stock shares issued | 2,759 |  |
Preferred stock repurchased during period shares | 1,444 |  |
Preferred stock, carrying value issued and outstanding | $ 28 |  |
Face value of repurchased preferred stock | 10.90% |  |
Dividend rate on preferred stock determined rate | LIBOR plus 200 basis points |  |
Unaffiliated Investors [Member] | MBIA Insurance Corporation [Member] |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock shares outstanding | 1,315 |  |

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- Definition Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (h) -URI https://asc.fasb.org/extlink&oid=126973232&loc=SL123496158-112644 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21484-112644 + Details
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