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Contingencies and Commitments - Narrative (Details) $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 23, 2019 AUD ($) | Dec. 13, 2016 AUD ($) | Sep. 30, 2018 action | Mar. 31, 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 |  |  |  | $ 209,000,000 | $ 198,000,000 |  |  |
Amount of disputed back charges |  |  |  | $ 2,000,000 | $ 2,000,000 |  |  |
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 |  |  |  |  |  |  |  | $ 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 |  |  |  |  |  | $ 35,000,000 |  |
Parent Company | Barrick | Fluor/TECHINT |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Letters of credit outstanding, amount |  |  |  |  |  | 23,500,000 |  |
Partnership Interest | Barrick | Fluor/TECHINT |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Letters of credit outstanding, amount |  |  |  |  |  | $ 11,500,000 |  |
Purple Line Transit Partners, LLC |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Partnership ownership interest |  |  |  | 15.00% |  |  |  |
Purple Line Transit Constructors, LLC |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Partnership ownership interest |  |  |  | 50.00% |  |  |  |

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