CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) [Abstract]
Net income (loss)	$ (1,044)	$ 396
Other comprehensive income (loss), after tax
Net unrealized losses on investments with an allowance for credit losses	(11)
Net unrealized gains (losses) on other investments	(1,044)	530
Total unrealized gains (losses) on investments	(1,055)	530
Unrealized losses on cash flow hedges	(19)	(6)
Pension and postretirement benefits	14	8
Foreign currency translation	(84)	17
Other comprehensive income (loss)	(1,144)	549
Comprehensive income (loss)	(2,188)	945
Amounts attributable to noncontrolling interests	531	(61)
Total comprehensive income (loss) attributable to Loews Corporation	$ (1,657)	$ 884