Contingencies and Commitments - Narrative (Details) $ in Millions			43 Months Ended
	Aug. 23, 2019 AUD ($)	Dec. 13, 2016 AUD ($)	Mar. 31, 2022 USD ($) action	Dec. 31, 2021 USD ($)	Aug. 31, 2019 USD ($)	Aug. 23, 2019 USD ($)	Aug. 12, 2016 USD ($)
Loss Contingencies [Line Items]
Number of actions filed | action			11
Contracts receivable			$ 215,000,000	$ 215,000,000
Pending Litigation
Loss Contingencies [Line Items]
Damages sought		$ 1,470
Sadara Chemical Company | Pending Litigation
Loss Contingencies [Line Items]
Damages sought	$ 100
Estimate of possible loss						$ 574,000,000
Fluor/TECHINT | Pending Litigation
Loss Contingencies [Line Items]
Estimate of possible loss			$ 364,000,000				$ 250,000,000
Barrick | Fluor/TECHINT
Loss Contingencies [Line Items]
Letters of credit outstanding, amount					$ 36,000,000
Parent Company | Barrick | Fluor/TECHINT
Loss Contingencies [Line Items]
Letters of credit outstanding, amount					24,000,000
Partnership Interest | Barrick | Fluor/TECHINT
Loss Contingencies [Line Items]
Letters of credit outstanding, amount					$ 12,000,000