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Commitments and Contingencies (Details) $ in Millions, $ in Millions |  |  | 1 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 09, 2020 USD ($) | May 28, 2020 AUD ($) | Mar. 31, 2019 USD ($) | May 31, 2018 USD ($) lawsuit | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |
Self insurance reserve, noncurrent |  |  |  |  | $ 47 | $ 42
Accounts Payable and Accrued Liabilities |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Self insurance reserve, noncurrent |  |  |  |  | 19 | 14
Other Current Liabilities |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Self insurance reserve, noncurrent |  |  |  |  | 3 | 2
Other Liabilities |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Self insurance reserve, noncurrent |  |  |  |  | $ 25 | $ 26
Chadian Employee Class Action |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Number of class action cases | lawsuit |  |  |  | 2 |  |
Damages awarded, value | $ 19 |  | $ 34 | $ 25 |  |
Claims in unpaid bonuses |  |  |  | $ 122 |  |
Chadian Employee Class Action | Provisional Award |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Damages awarded, value |  |  | $ 2 |  |  |
North West Rail Link Project |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Claims in unpaid bonuses |  | $ 301 |  |  |  |
North West Rail Link Project | Unincorporated Joint Venture |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Ownership percentage (in percentage) |  |  |  |  | 33.00% |

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