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Contingencies and Commitments - Narrative (Details)
$ in Millions
1 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Aug. 23, 2019
AUD ($)
Dec. 13, 2016
AUD ($)
Sep. 30, 2018
action
Jun. 23, 2020
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Aug. 31, 2019
USD ($)
Aug. 23, 2019
USD ($)
Aug. 12, 2016
USD ($)
Loss Contingencies [Line Items]                  
Number of actions filed | action     9            
Contracts receivable         $ 214,000,000 $ 198,000,000      
Amount of disputed back charges         $ 1,000,000 $ 2,000,000      
Pending litigation                  
Loss Contingencies [Line Items]                  
Damages sought   $ 1,470              
Sadara Chemical Company | Pending litigation                  
Loss Contingencies [Line Items]                  
Estimate of possible loss               $ 574,000,000  
Damages sought $ 100                
Fluor/TECHINT | Pending litigation                  
Loss Contingencies [Line Items]                  
Estimate of possible loss                 $ 250,000,000
Purple Line Transit Project | Minimum                  
Loss Contingencies [Line Items]                  
Right to terminate contract, period       365 days          
DB Contract | Minimum                  
Loss Contingencies [Line Items]                  
Right to terminate contract, period       365 days          
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    
Purple Line Transit Partners, LLC                  
Loss Contingencies [Line Items]                  
Ownership interest       15.00%          
Purple Line Transit Constructors, LLC                  
Loss Contingencies [Line Items]                  
Ownership interest       50.00%