Acquisitions, Divestitures and Deconsolidations - Loews Hotels & Co (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Subsidiary, Sale of Stock [Line Items]
Investment gains (losses)	$ (53)	$ (199)	$ 660
Total assets	79,197	75,567
Total liabilities	62,672	$ 60,366
Loews Hotels & Co
Subsidiary, Sale of Stock [Line Items]
Proceeds from sale of assets			$ 77
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
Total assets	232
Total liabilities	$ 120