CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) [Abstract]
Net income (loss)	$ 793	$ (846)	$ 1,086	$ (1,890)
Other comprehensive income (loss), after tax
Net unrealized gains (losses) on investments with an allowance for credit losses		2		(9)
Net unrealized gains (losses) on other investments	300	1,191	(327)	147
Total unrealized gains (losses) on investments	300	1,193	(327)	138
Unrealized gains (losses) on cash flow hedges	8		12	(19)
Pension and postretirement benefits	7	6	16	20
Foreign currency translation	11	29	14	(55)
Other comprehensive income (loss)	326	1,228	(285)	84
Comprehensive income (loss)	1,119	382	801	(1,806)
Amounts attributable to noncontrolling interests	(72)	(119)	(40)	412
Total comprehensive income (loss) attributable to Loews Corporation	$ 1,047	$ 263	$ 761	$ (1,394)