Property, Plant and Equipment - Asset Impairments (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2020 Rig Extension	Dec. 31, 2022 USD ($) Property	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) Property
Asset Impairments [Abstract]
Asset impairment charge		$ 33	$ 10	$ 810
Number of drilling rigs impaired | Extension	4
Loews Hotels & Co
Asset Impairments [Abstract]
Number of hotel properties impaired | Property		2		1
Asset impairment charge		$ 25		$ 30
Asset impairment charge, after tax		$ 19		22
Diamond Offshore Drilling Inc.
Asset Impairments [Abstract]
Asset impairment charge				774
Asset impairment charge, after tax				$ 408
Number of drilling rigs evaluated for impairment | Rig	5