CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 1,703	$ (1,291)	$ 871
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Net unrealized losses on investments with an allowance for credit losses	(2)
Net unrealized gains (losses) on other investments	(706)	720	948
Total unrealized gains (losses) on investments	(708)	720	948
Unrealized gains (losses) on cash flow hedges	17	(17)	(11)
Pension and postretirement benefits	266	(24)	(68)
Foreign currency translation	(20)	48	42
Other comprehensive income (loss)	(445)	727	911
Comprehensive income (loss)	1,258	(564)	1,782
Amounts attributable to noncontrolling interests	(75)	282	(38)
Total comprehensive income (loss) attributable to Loews Corporation	$ 1,183	$ (282)	$ 1,744