Schedule II. Condensed Financial Information of Registrant (Parent Company) (Narrative) (Details)	Dec. 31, 2025
CNAF Consolidated \| Loews
Condensed Financial Statements, Captions [Line Items]
Noncontrolling interest, ownership percentage by parent	92.00%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
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-Section 12
-Subsection 04
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
-Number 210
-Section 9
-Subsection 06
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Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 8: http://www.xbrl.org/2003/role/recommendedDisclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 205
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-Name Accounting Standards Codification
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-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481003/205-10-S50-2

+ Details