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Contingencies and Commitments (Details) - Pending litigation $ in Millions, $ in Millions |  | 1 Months Ended
--- | --- | ---
Dec. 13, 2016 AUD ($) claim | Sep. 30, 2023 USD ($) wall | Mar. 31, 2023 referee | Oct. 31, 2022 USD ($)
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 |  |  |
Santos Ltd Claim 1 |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of claims | claim | 1 |  |  |
Loss contingency, panel referred damages awarded from other party, value | $ 700 |  |  |
Santos Ltd Claim 2 |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Loss contingency, panel referred damages awarded from other party, value | $ 790 |  |  |
North Texas Tollway Authority |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Damages sought |  | $ 227 |  | $ 100
Number of retaining walls | wall |  | 65 |  |

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