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Contingencies and Commitments (Details) $ in Millions |  |  | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 23, 2019 USD ($) | Dec. 13, 2016 AUD ($) claim | Dec. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) wall | 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 derivative actions filed | action |  |  |  |  |  |  | 11 |  |  |  |
Fluor T E C H I N T | Barrick |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding, amount |  |  |  |  |  |  |  |  |  | $ 36,000,000 |
Fluor T E C H I N T | Barrick | Parent Company |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding, amount |  |  |  |  |  |  |  |  |  | 24,000,000 |
Fluor T E C H I N T | Barrick | Partnership Interest |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Letters of credit outstanding, amount |  |  |  |  |  |  |  |  |  | $ 12,000,000 |
SEC Investigation |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
De-recognized pre-petition accounts receivable |  |  |  | $ 15,000,000 |  |  |  |  |  |  |
Pending litigation | Santos Ltd |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Damages sought |  | $ 1,470 |  |  |  |  |  |  |  |  |
Number of referees appointed | referee |  |  |  |  | 3 |  |  |  |  |  |
Estimate of possible loss |  | $ 236 |  |  |  |  |  |  |  |  |
Pending litigation | Santos Ltd Claim 1 |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of pending matters | 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 | North Texas Tollway Authority |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Damages sought |  |  |  | $ 227,000,000 |  | $ 100,000,000 |  |  |  |  |
Number of retaining walls | wall |  |  |  | 65 |  |  |  |  |  |  |
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 | Minimum |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Litigation settlement interest |  |  | $ 3,000,000 |  |  |  |  |  |  |  |
Pending litigation | Sadara Chemical Company | Maximum |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Litigation settlement interest |  |  | 5,000,000 |  |  |  |  |  |  |  |
Pending litigation | Fluor T E C H I N T |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimate of possible loss |  |  | $ 364,000,000 |  |  |  |  | $ 364,000,000 |  |  | $ 250,000,000
Pending litigation | Fluor T E C H I N T | Barrick |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |
Litigation settlement, expense |  |  |  |  |  |  |  |  | $ 12,000,000 |  |
Litigation settlement interest |  |  |  |  |  |  |  | $ 11,000,000 |  |  |

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