Consolidated 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]
Beginning Balance at Dec. 31, 2016	$ 23,361	$ 3	$ 3,187	$ 15,196	$ (223)		$ 5,198
Net income	1,412			1,164			248
Other comprehensive income (loss)	218				197		21
Dividends paid ($0.25 per share)	(223)			(84)			(139)
Purchases of Loews treasury stock	(237)					$ (237)
Retirement of treasury stock	1		(41)	(175)		217
Stock-based compensation	35		2				33
Other	(1)		3	(5)			1
Ending Balance at Dec. 31, 2017	24,566	3	3,151	16,096	(26)	(20)	5,362
Cumulative effect adjustments from changes in accounting standards at Dec. 31, 2017	(91)			(43)	(28)		(20)
Balance, as adjusted at Dec. 31, 2017	24,475	3	3,151	16,053	(54)	(20)	5,342
Net income	706			636			70
Other comprehensive income (loss)	(892)				(797)		(95)
Dividends paid ($0.25 per share)	(201)			(80)			(121)
Purchase of Boardwalk Pipelines common units	(1,718)		658		(29)		(2,347)
Purchases of Loews treasury stock	(1,011)					(1,011)
Retirement of treasury stock			(195)	(831)		1,026
Stock-based compensation	31		19				12
Other	(4)		(6)	(5)			7
Ending Balance at Dec. 31, 2018	21,386	3	3,627	15,773	(880)	(5)	2,868
Net income	871			932			(61)
Other comprehensive income (loss)	911				812		99
Dividends paid ($0.25 per share)	(174)			(76)			(98)
Purchase of subsidiary stock from noncontrolling interests	(23)						(23)
Purchases of Loews treasury stock	(1,059)					(1,059)
Retirement of treasury stock			(248)	(803)		1,051
Stock-based compensation	27		4				23
Other	(9)		(9)	(3)			3
Ending Balance at Dec. 31, 2019	$ 21,930	$ 3	$ 3,374	$ 15,823	$ (68)	$ (13)	$ 2,811