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]
Beginning Balance at Dec. 31, 2016	$ 23,361	$ 3	$ 3,187	$ 15,196	$ (223)		$ 5,198
Net income	669			526			143
Other comprehensive income (loss)	208				187		21
Dividends paid	(138)			(42)
Dividends paid							(96)
Purchases of Loews treasury stock	(6)					$ (6)
Stock-based compensation	14		(9)				23
Other	(2)			(3)			1
Ending Balance at Jun. 30, 2017	24,106	3	3,178	15,677	(36)	(6)	5,290
Net income	278
Other comprehensive income (loss)	126
Ending Balance at Jun. 30, 2017	24,106	3	3,178	15,677	(36)	(6)	5,290
Beginning Balance at Dec. 31, 2017	24,566	3	3,151	16,096	(26)	(20)	5,362
Cumulative effect adjustment 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	628			523			105
Other comprehensive income (loss)	(606)				(542)		(64)
Dividends paid	(140)			(40)
Dividends paid							(100)
Purchase of Boardwalk Pipeline common units	(1,715)		661		(29)		(2,347)
Purchases of Loews treasury stock	(788)					(788)
Stock-based compensation	8		1				7
Other	(4)		(4)	(4)			4
Ending Balance at Jun. 30, 2018	21,858	3	3,809	16,532	(625)	(808)	2,947
Net income	248
Other comprehensive income (loss)	(199)
Ending Balance at Jun. 30, 2018	$ 21,858	$ 3	$ 3,809	$ 16,532	$ (625)	$ (808)	$ 2,947