CONSOLIDATED CONDENSED STATEMENTS OF EQUITY - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Common Stock Held in Treasury [Member]	Noncontrolling Interests [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Common Stock [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Additional Paid-in Capital [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Accumulated Other Comprehensive Income (Loss) [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Common Stock Held in Treasury [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member] Noncontrolling Interests [Member]
Balance at Dec. 31, 2019	$ 21,930	$ 3	$ 3,374	$ 15,823	$ (68)	$ (13)	$ 2,811	$ (5)	$ (5)	$ 21,925	$ 3	$ 3,374	$ 15,818	$ (68)	$ (13)	$ 2,811
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income (loss)	(1,044)			(632)			(412)
Other comprehensive income (loss)	(1,144)				(1,025)		(119)
Dividends paid ($0.0625 per share)	(87)			(18)
Dividends paid ($0.0625 per share)							(69)
Purchases of Loews Corporation treasury stock	(445)					(445)
Purchases of subsidiary stock from non-controlling interests	(18)						(18)
Stock-based compensation	(4)		(22)				18
Other	(5)		(5)	(1)			1
Balance at Mar. 31, 2020	19,178	3	3,347	15,167	(1,093)	(458)	2,212
Balance at Dec. 31, 2020	19,181	3	3,133	14,150	581	(7)	1,321
Increase (Decrease) in Shareholders' Equity [Roll Forward]
Net income (loss)	293			261			32
Other comprehensive income (loss)	(611)				(547)		(64)
Dividends paid ($0.0625 per share)	(49)			(17)
Dividends paid ($0.0625 per share)							(32)
Purchases of Loews Corporation treasury stock	(274)					(274)
Purchases of subsidiary stock from non-controlling interests	(3)						(3)
Stock-based compensation	4		(11)				15
Other	(4)		(3)			1	(2)
Balance at Mar. 31, 2021	$ 18,537	$ 3	$ 3,119	$ 14,394	$ 34	$ (280)	$ 1,267