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Commitments and Contingencies (Details)
$ in Millions
1 Months Ended 3 Months Ended
Nov. 01, 2023
USD ($)
Aug. 23, 2019
USD ($)
Dec. 13, 2016
AUD ($)
claim
Sep. 30, 2023
USD ($)
Mar. 31, 2023
referee
Oct. 31, 2022
USD ($)
Sep. 30, 2018
action
Dec. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
Aug. 31, 2019
USD ($)
Aug. 12, 2016
USD ($)
Loss Contingencies [Line Items]                      
Number of actions filed | action             11        
SEC Investigation                      
Loss Contingencies [Line Items]                      
Civil penalty       $ 15,000,000              
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  
Pending litigation | Santos Ltd                      
Loss Contingencies [Line Items]                      
Damages sought     $ 1,470                
Loss contingency, trial or alternative dispute resolution, number of referees apointed | referee         3            
Estimate of possible loss     $ 236                
Pending litigation | Sadara Chemical Company                      
Loss Contingencies [Line Items]                      
Damages sought   $ 100,000,000                  
Estimate of possible loss   $ 574,000,000                  
Litigation settlement, expense                 $ 14,000,000    
Pending litigation | Sadara Chemical Company | Subsequent Event                      
Loss Contingencies [Line Items]                      
Litigation settlement interest $ 3,000,000                    
Pending litigation | Fluor/TECHINT                      
Loss Contingencies [Line Items]                      
Estimate of possible loss       364,000,000         364,000,000   $ 250,000,000
Pending litigation | North Texas Tollway Authority                      
Loss Contingencies [Line Items]                      
Damages sought       $ 227,000,000   $ 100,000,000          
Pending litigation | Santos Ltd Claim 1                      
Loss Contingencies [Line Items]                      
Number of claims | claim     1                
Loss contingency, panel referred damages awarded from other party, value     $ 700                
Pending litigation | Santos Ltd Claim 2                      
Loss Contingencies [Line Items]                      
Loss contingency, panel referred damages awarded from other party, value     $ 790                
Pending litigation | Barrick | Fluor/TECHINT                      
Loss Contingencies [Line Items]                      
Litigation settlement, expense                 $ 12,000,000    
Pending litigation | Barrick | Fluor/TECHINT | Forecast                      
Loss Contingencies [Line Items]                      
Litigation settlement interest               $ 11,000,000