Acquisitions, Divestitures and Deconsolidations - Loews Hotels & Co (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) subsidiary	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Subsidiary, Sale of Stock [Line Items]
Investment gains (losses)	$ (81)	$ (53)	$ (199)
Assets	81,943	79,197
Liabilities	$ 64,006	62,672
Loews Hotels & Co
Subsidiary, Sale of Stock [Line Items]
Number of subsidiaries | subsidiary	2
Payments to acquire additional interest in subsidiaries	$ 44
Proceeds from sale of assets	23
Investment gains (losses)		46
Assets	$ 2,498	2,374
Loews Hotels And Co
Subsidiary, Sale of Stock [Line Items]
Payments to acquire an additional equity interest in joint venture property		46
Loews Hotels And Co | Joint venture
Subsidiary, Sale of Stock [Line Items]
Investment gains (losses)		46
Gain on investments, net of tax		36
Assets		232
Liabilities		$ 120