Acquisitions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Asset Acquisition [Line Items]
Gain on investments	$ 14	$ (59)	$ (21)	$ (70)
Assets	77,347		77,347		$ 75,567
Liabilities	61,877		61,877		$ 60,366
Joint Venture
Asset Acquisition [Line Items]
Gain on investments	46		46
Loews Hotels And Co
Asset Acquisition [Line Items]
Payments to acquire an additional equity interest in joint venture property	46
Loews Hotels And Co | Joint Venture
Asset Acquisition [Line Items]
Gain on investments	46
Gain on investments, net of tax	36
Assets	232		232
Liabilities	$ 120		$ 120