Schedule I - Condensed Financial Information of Registrant, Statements of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Activities:
Net income (loss)	$ 1,545	$ 891	$ 1,685
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities:
Equity method investees	18	236	(74)
Investment loss	53	199	(660)
Provision for deferred income taxes	127	(50)	209
Changes in operating assets and liabilities, net:
Trading securities	577	159	(49)
Net cash flow provided by operating activities	3,907	3,314	2,623
Investing Activities:
Change in investments, primarily short-term	(80)	(27)	(141)
Other	(178)	(92)	87
Net cash flow used by investing activities	(2,745)	(2,347)	(1,187)
Financing Activities:
Dividends paid	(57)	(61)	(65)
Purchases of treasury shares	(849)	(729)	(1,136)
Payment of debt	(878)	(640)	(1,193)
Other	(18)	(16)	(12)
Net cash flow used by financing activities	(1,300)	(1,037)	(1,289)
Net change in cash	(133)	(89)	143
Cash, beginning of year	532	621	478
Cash, end of year	399	532	621
Loews Corporation
Operating Activities:
Net income (loss)	1,434	822	1,562
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities:
Equity method investees	(512)	(3)	(804)
Investment loss			15
Provision for deferred income taxes	(4)	(49)	7
Changes in operating assets and liabilities, net:
Receivables	10	(11)
Accounts payable and accrued liabilities	(9)	(47)	(48)
Trading securities	576	153	(69)
Other, net	109	39	82
Net cash flow provided by operating activities	1,604	904	745
Investing Activities:
Investments in and advances to subsidiaries	(217)	(137)	385
Change in investments, primarily short-term	29	30	72
Other	(11)	(9)
Net cash flow used by investing activities	(199)	(116)	457
Financing Activities:
Dividends paid	(57)	(61)	(65)
Purchases of treasury shares	(849)	(729)	(1,136)
Payment of debt	(500)
Other	(5)	(7)	(4)
Net cash flow used by financing activities	(1,411)	(797)	(1,205)
Net change in cash	(6)	(9)	(3)
Cash, beginning of year	10	19	22
Cash, end of year	4	10	19
Cash dividends paid to Company by affiliates	$ 1,006	$ 978	$ 853