Schedule I - Condensed Financial Information of Registrant, Statements of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Operating Activities:
Net income	$ 1,772	$ 1,494	$ 1,545
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities:
Equity method investees	9	(66)	18
Provision (benefit) for deferred income taxes	112	(45)	127
Changes in operating assets and liabilities, net:
Receivables	(408)	(929)	(268)
Trading securities	(413)	(695)	577
Net cash flow provided by operating activities	3,279	3,025	3,907
Investing Activities:
Change in investments, primarily short-term	(920)	(30)	(80)
Purchases of equity securities	(593)	(444)	(293)
Purchases of limited partnership investments	(447)	(335)	(402)
Other	(82)	9	(178)
Net cash flow used by investing activities	(2,828)	(1,975)	(2,745)
Financing Activities:
Dividends paid	(52)	(55)	(57)
Purchases of treasury shares	(806)	(608)	(849)
Payment of debt	(869)	(1,366)	(878)
Other	(67)	(58)	(18)
Net cash flow used by financing activities	(513)	(898)	(1,300)
Net change in cash	(46)	142	(133)
Cash, beginning of year	541	399	532
Cash, end of year	495	541	399
Loews Corporation
Operating Activities:
Net income	1,667	1,414	1,434
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities:
Equity method investees	(268)	(67)	(512)
Provision (benefit) for deferred income taxes	2	4	(4)
Changes in operating assets and liabilities, net:
Receivables	(3)	(6)	10
Accounts payable and accrued liabilities	14	(12)	(9)
Trading securities	(414)	(695)	576
Other, net	31	2	109
Net cash flow provided by operating activities	1,029	640	1,604
Investing Activities:
Investments in and advances to subsidiaries	(1)	2	(217)
Change in investments, primarily short-term	(50)	27	29
Purchases of equity securities	(20)
Purchases of limited partnership investments	(88)
Other			(11)
Net cash flow used by investing activities	(159)	29	(199)
Financing Activities:
Dividends paid	(52)	(55)	(57)
Purchases of treasury shares	(806)	(608)	(849)
Payment of debt			(500)
Other	(13)	(4)	(5)
Net cash flow used by financing activities	(871)	(667)	(1,411)
Net change in cash	(1)	2	(6)
Cash, beginning of year	6	4	10
Cash, end of year	5	6	4
Cash dividends paid to Company by affiliates	$ 1,500	$ 1,300	$ 1,000