Property, Plant and Equipment, Asset Impairments (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2020 Extension Rig	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) Property	Dec. 31, 2019 USD ($) Property
Asset Impairments [Abstract]
Asset impairment charge		$ 10	$ 810	$ 99
Number of drilling rigs impaired | Extension	4
Diamond Offshore Drilling Inc.
Asset Impairments [Abstract]
Number of drilling rigs evaluated for impairment | Rig	5
Asset impairment charge			774
Asset impairment charge, after tax			408
Lodging and related services – Loews Hotels & Co
Asset Impairments [Abstract]
Asset impairment charge			30	99
Asset impairment charge, after tax			$ 22	$ 77
Number of hotel properties impaired | Property			1	4