Schedule I - Condensed Financial Information of Registrant, Statements of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2018
Operating Activities:
Net income (loss)	$ 1,103	$ 1,703	$ (1,291)
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities:
Equity method investees	236	(74)	102
Provision for deferred income taxes	5	213	(235)
Changes in operating assets and liabilities, net:
Receivables	(316)	(1,409)	(425)
Trading securities	159	(49)	(571)
Net cash flow provided by operating activities	3,314	2,623	1,745
Investing Activities:
Change in investments, primarily short term	(27)	(141)	427
Other	(92)	87	(127)
Net cash flow used by investing activities	(2,347)	(1,187)	(1,414)
Financing Activities:
Dividends paid	(61)	(65)	(70)
Purchases of treasury shares	(729)	(1,136)	(923)
Issuance of debt	573	1,199	2,659
Other	(16)	(12)	(2)
Net cash flow used by financing activities	(1,037)	(1,289)	(198)
Net change in cash	(89)	143	142
Cash, beginning of year	621	478	336
Cash, end of year	532	621	478
Loews Corporation
Operating Activities:
Net income (loss)	1,012	1,578	(931)
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities:
Equity method investees	(193)	(820)	834
Loss on deconsolidation		15	1,211
Provision for deferred income taxes	(49)	7	(196)
Changes in operating assets and liabilities, net:
Receivables	(11)
Accounts payable and accrued liabilities	(47)	(48)	(38)
Trading securities	153	(69)	(566)
Other, net	39	82	44
Net cash flow provided by operating activities	904	745	358
Investing Activities:
Investments in and advances to subsidiaries	(137)	385	(169)
Change in investments, primarily short term	30	72	326
Other	(9)
Net cash flow used by investing activities	(116)	457	157
Financing Activities:
Dividends paid	(61)	(65)	(70)
Purchases of treasury shares	(729)	(1,136)	(923)
Issuance of debt			495
Other	(7)	(4)	(5)
Net cash flow used by financing activities	(797)	(1,205)	(503)
Net change in cash	(9)	(3)	12
Cash, beginning of year	19	22	10
Cash, end of year	10	19	22
Cash dividends paid to Company by affiliates	$ 978	$ 853	$ 947