Schedule I - Condensed Financial Information of Registrant, Statements of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Operating Activities:
Net income	$ 1,494	$ 1,545	$ 891
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities:
Equity method investees	(66)	18	236
Provision (benefit) for deferred income taxes	(45)	127	(50)
Changes in operating assets and liabilities, net:
Receivables	(929)	(268)	(316)
Trading securities	(695)	577	159
Net cash flow provided by operating activities	3,025	3,907	3,314
Investing Activities:
Change in investments, primarily short-term	(30)	(80)	(27)
Other	(14)	(178)	(171)
Net cash flow used by investing activities	(1,975)	(2,745)	(2,347)
Financing Activities:
Dividends paid	(55)	(57)	(61)
Purchases of treasury shares	(608)	(849)	(729)
Payment of debt	(1,366)	(878)	(640)
Other	(58)	(18)	(16)
Net cash flow used by financing activities	(898)	(1,300)	(1,037)
Net change in cash	142	(133)	(89)
Cash, beginning of year	399	532	621
Cash, end of year	541	399	532
Loews Corporation
Operating Activities:
Net income	1,414	1,434	822
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities:
Equity method investees	(67)	(512)	(3)
Provision (benefit) for deferred income taxes	4	(4)	(49)
Changes in operating assets and liabilities, net:
Receivables	(6)	10	(11)
Accounts payable and accrued liabilities	(12)	(9)	(47)
Trading securities	(695)	576	153
Other, net	2	109	39
Net cash flow provided by operating activities	640	1,604	904
Investing Activities:
Investments in and advances to subsidiaries	2	(217)	(137)
Change in investments, primarily short-term	27	29	30
Other		(11)	(9)
Net cash flow used by investing activities	29	(199)	(116)
Financing Activities:
Dividends paid	(55)	(57)	(61)
Purchases of treasury shares	(608)	(849)	(729)
Payment of debt		(500)
Other	(4)	(5)	(7)
Net cash flow used by financing activities	(667)	(1,411)	(797)
Net change in cash	2	(6)	(9)
Cash, beginning of year	4	10	19
Cash, end of year	6	4	10
Cash dividends paid to Company by affiliates	$ 1,300	$ 1,000	$ 1,000