CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 1,545	$ 891	$ 1,685
Other comprehensive income (loss), after tax
Net unrealized losses on investments with an allowance for credit losses	(5)	(5)	(2)
Net unrealized gains (losses) on other investments	1,125	(6,097)	(987)
Total unrealized gains (losses) on investments	1,120	(6,102)	(989)
Impact of changes in discount rates used to measure long-duration contract liabilities	(318)	3,959	941
Unrealized gains (losses) on cash flow hedges	(5)	20	17
Pension and postretirement benefits	104	15	266
Foreign currency translation	60	(111)	(20)
Other comprehensive income (loss)	961	(2,219)	215
Comprehensive income (loss)	2,506	(1,328)	1,900
Amounts attributable to noncontrolling interests	(188)	150	(142)
Total comprehensive income (loss) attributable to Loews Corporation	$ 2,318	$ (1,178)	$ 1,758