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Commitments and Contingencies - Schedule of Environmental Loss Contingencies (Details) - Excluding Line 901 Incident - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Loss Contingencies [Line Items] |  |
Estimated undiscounted reserve for environmental liabilities, short-term | $ 14 | $ 10
Estimated undiscounted reserve for environmental liabilities, short-term [Extensible Enumeration] | Other current liabilities | Other current liabilities
Estimated undiscounted reserve for environmental liabilities, long-term | $ 45 | $ 46
Estimated undiscounted reserve for environmental liabilities, long-term [Extensible Enumeration] | Other long-term liabilities and deferred credits | Other long-term liabilities and deferred credits
Estimated undiscounted reserve for environmental liabilities | $ 59 | $ 56
Schedule of Environmental Loss Contingencies | Our estimated undiscounted reserve for environmental liabilities (excluding liabilities related to the Line 901 incident, as discussed further below) were reflected on our Condensed Consolidated Balance Sheets as follows (in millions):
| September 30, 2024 |  | December 31, 2023
Other current liabilities | $ | 14 |  |  | $ | 10 |
Other long-term liabilities and deferred credits | $ | 45 |  |  | $ | 46 |
Total | $ | 59 |  |  | $ | 56 |

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