CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 1,103	$ 1,703	$ (1,291)
Other comprehensive income (loss), after tax
Net unrealized losses on investments with an allowance for credit losses	(5)	(2)
Net unrealized gains (losses) on other investments	(3,777)	(706)	720
Total unrealized gains (losses) on investments	(3,782)	(708)	720
Unrealized gains (losses) on cash flow hedges	20	17	(17)
Pension and postretirement benefits	15	266	(24)
Foreign currency translation	(111)	(20)	48
Other comprehensive income (loss)	(3,858)	(445)	727
Comprehensive income (loss)	(2,755)	1,258	(564)
Amounts attributable to noncontrolling interests	297	(75)	282
Total comprehensive income (loss) attributable to Loews Corporation	$ (2,458)	$ 1,183	$ (282)