COVER - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Feb. 03, 2023	Jun. 30, 2022
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2022
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	1-06541
Entity Registrant Name	LOEWS CORP
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	13-2646102
Entity Address, Address Line One	667 Madison Avenue
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10065-8087
City Area Code	212
Local Phone Number	521-2000
Title of 12(b) Security	Common stock, par value $0.01 per share
Trading Symbol	L
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 11,809
Entity Common Stock, Shares Outstanding		234,997,673
Documents Incorporated by Reference	Portions of the registrant’s definitive proxy statement for the 2023 annual meeting of shareholders, intended to be filed by the registrant with the Commission not later than 120 days after the close of its fiscal year, are incorporated by reference into Part III of this Report.
Entity Central Index Key	0000060086
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2022
Amendment Flag	false