CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 1,494	$ 1,545	$ 891
Other comprehensive income (loss), after tax
Net unrealized losses on investments with an allowance for credit losses	(1)	(5)	(5)
Net unrealized gains (losses) on other investments	(262)	1,125	(6,097)
Total unrealized gains (losses) on investments	(263)	1,120	(6,102)
Impact of changes in discount rates used to measure long-duration contract liabilities	712	(318)	3,959
Unrealized gains (losses) on cash flow hedges		(5)	20
Pension and postretirement benefits	340	104	15
Foreign currency translation	(102)	60	(111)
Other comprehensive income (loss)	687	961	(2,219)
Comprehensive income (loss)	2,181	2,506	(1,328)
Amounts attributable to noncontrolling interests	(137)	(188)	150
Total comprehensive income (loss) attributable to Loews Corporation	$ 2,044	$ 2,318	$ (1,178)