CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Common Stock Held in Treasury	Noncontrolling Interests	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjustment Retained Earnings	Cumulative Effect, Period of Adoption, Adjusted Balance	Cumulative Effect, Period of Adoption, Adjusted Balance Common Stock	Cumulative Effect, Period of Adoption, Adjusted Balance Additional Paid-in Capital	Cumulative Effect, Period of Adoption, Adjusted Balance Retained Earnings	Cumulative Effect, Period of Adoption, Adjusted Balance Accumulated Other Comprehensive Income (Loss)	Cumulative Effect, Period of Adoption, Adjusted Balance Common Stock Held in Treasury	Cumulative Effect, Period of Adoption, Adjusted Balance Noncontrolling Interests
Balance at beginning of period at Dec. 31, 2018	$ 21,386	$ 3	$ 3,627	$ 15,773	$ (880)	$ (5)	$ 2,868
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	871			932			(61)
Other comprehensive income	911				812		99
Dividends paid ($0.25 per share)	(174)			(76)
Dividends paid ($0.25 per share)							(98)
Purchase of subsidiary stock from noncontrolling interests	(23)						(23)
Purchases of Loews Corporation treasury stock	(1,059)					(1,059)
Retirement of treasury stock	0		(248)	(803)		1,051
Stock-based compensation	27		4				23
Other	(9)		(9)	(3)			3
Balance at end of period 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 Stockholders' Equity [Roll Forward]
Net income	(1,291)			(931)			(360)
Other comprehensive income	727				649		78
Dividends paid ($0.25 per share)	(169)			(70)
Dividends paid ($0.25 per share)							(99)
Purchase of subsidiary stock from noncontrolling interests	(37)		5				(42)
Deconsolidation of Diamond Offshore	(1,087)						(1,087)
Purchases of Loews Corporation treasury stock	(917)					(917)
Retirement of treasury stock	0		(256)	(667)		923
Stock-based compensation	26		8				18
Other	4		2				2
Balance at end of period at Dec. 31, 2020	19,181	3	3,133	14,150	581	(7)	1,321
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,703			1,578			125
Other comprehensive income	(445)				(395)		(50)
Dividends paid ($0.25 per share)	(129)			(65)
Dividends paid ($0.25 per share)							(64)
Purchase of subsidiary stock from noncontrolling interests	(18)						(18)
Purchases of Loews Corporation treasury stock	(1,132)					(1,132)
Retirement of treasury stock	0	(1)	(246)	(889)		1,136
Stock-based compensation	15		(2)				17
Other	0			2			(2)
Balance at end of period at Dec. 31, 2021	$ 19,175	$ 2	$ 2,885	$ 14,776	$ 186	$ (3)	$ 1,329