CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Millions	Total	Cumulative Effect, Adjustment	Previously Reported	Common Stock	Common Stock Previously Reported	Additional Paid-in Capital	Additional Paid-in Capital Previously Reported	Retained Earnings	Retained Earnings Cumulative Effect, Adjustment	Retained Earnings Previously Reported	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Adjustment	Accumulated Other Comprehensive Income (Loss) Previously Reported	Common Stock Held in Treasury	Common Stock Held in Treasury Previously Reported	Noncontrolling Interests	Noncontrolling Interests Cumulative Effect, Adjustment	Noncontrolling Interests Previously Reported
Balance at beginning of period at Dec. 31, 2020	$ 16,835	$ (2,346)	$ 19,181	$ 3	$ 3	$ 3,133	$ 3,133	$ 14,145	$ (5)	$ 14,150	$ (1,516)	$ (2,097)	$ 581	$ (7)	$ (7)	$ 1,077	$ (244)	$ 1,321
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,685		1,703					1,562								123
Other comprehensive income (loss)	215		(445)								196					19
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							1								(1)
Balance at end of period at Dec. 31, 2021	17,471			2		2,885		14,754			(1,320)			(3)		1,153
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	891		1,103					822								69
Other comprehensive income (loss)	(2,219)		(3,858)								(2,000)					(219)
Dividends paid ($0.25 per share)	(159)							(61)
Dividends paid ($0.25 per share)																(98)
Purchase of subsidiary stock from noncontrolling interests	(66)					4										(70)
Purchases of Loews Corporation treasury stock	(738)													(738)
Retirement of treasury stock	0					(146)		(583)						729
Stock-based compensation	21					3										18
Other	0					2		(1)								(1)
Balance at end of period at Dec. 31, 2022	15,201		$ 15,478	2		2,748		14,931			(3,320)			(12)		852
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	1,545							1,434								111
Other comprehensive income (loss)	961										884					77
Dividends paid ($0.25 per share)	(131)							(57)
Dividends paid ($0.25 per share)																(74)
Purchase of subsidiary stock from noncontrolling interests	(202)					27					(61)					(168)
Purchases of Loews Corporation treasury stock	(852)													(852)
Retirement of treasury stock	0					(164)		(693)						857
Stock-based compensation	26					3										23
Other	(23)					(25)		2
Balance at end of period at Dec. 31, 2023	$ 16,525			$ 2		$ 2,589		$ 15,617			$ (2,497)			$ (7)		$ 821