CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE LOSS [Abstract]
Net income (loss)	$ 293	$ (1,044)
Other comprehensive loss, after tax
Net unrealized losses on investments with an allowance for credit losses		(11)
Net unrealized losses on other investments	(627)	(1,044)
Total unrealized losses on investments	(627)	(1,055)
Unrealized gains (losses) on cash flow hedges	4	(19)
Pension and postretirement benefits	9	14
Foreign currency translation	3	(84)
Other comprehensive loss	(611)	(1,144)
Comprehensive loss	(318)	(2,188)
Amounts attributable to noncontrolling interests	32	531
Total comprehensive loss attributable to Loews Corporation	$ (286)	$ (1,657)