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Regulatory Matters, Commitments, Contingencies And Environmental Liabilities Narrative (Details) |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
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Dec. 17, 2024 USD ($) | Sep. 28, 2023 USD ($) Rate | Jan. 09, 2023 USD ($) | Dec. 02, 2022 USD ($) | Oct. 24, 2022 USD ($) | Aug. 30, 2020 USD ($) | Aug. 17, 2020 USD ($) | Nov. 30, 2017 USD ($) | Sep. 30, 2025 USD ($) sites | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) sites | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($)
Accrual for Environmental Loss Contingencies |  |  |  |  |  |  |  |  | $ 271,000,000 |  | $ 271,000,000 |  | $ 278,000,000
Loss Contingency Accrual, at Carrying Value |  |  |  |  |  |  |  |  | 313,000,000 |  | 313,000,000 |  | $ 281,000,000
Loss Contingency, Estimate of Possible Loss |  |  |  |  |  |  |  |  | 42,000,000 |  | 42,000,000 |  |
Payments for Environmental Liabilities |  |  |  |  |  |  |  |  |  |  | 26,000,000 | $ 7,000,000 |
ROW Expense |  |  |  |  |  |  |  |  | 27,000,000 | $ 23,000,000 | 62,000,000 | 50,000,000 |
Income tax expense |  |  |  |  |  |  |  |  | $ 87,000,000 | $ 89,000,000 | $ 207,000,000 | $ 405,000,000 |
State of Ohio and Ohio Environmental Protection Agency |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Sought, Value |  |  |  |  |  |  |  | $ 3,000,000 |  |  |  |  |
Sunoco, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Pending Claims, Number |  |  |  |  |  |  |  |  | 2 |  | 2 |  |
Sunoco [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Site Contingency, Number of Sites Needing Remediation | sites |  |  |  |  |  |  |  |  | 31 |  | 31 |  |
USAC [Member] | Internal Revenue Service (IRS) |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination, Estimate of Possible Loss |  |  |  |  |  |  |  |  |  |  | $ 30,000,000 |  |
Income tax expense |  |  |  |  |  |  |  |  |  |  | 3,000,000 |  |
Rover - FERC - Tuscarawas | Proposed Civil Penalty |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Sought, Value |  |  |  |  |  |  |  |  |  |  | 40,000,000 |  |
Sunoco LP [Member] | New York Motor Fuel Excise Tax Audit |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Sought, Value |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |
Cline Class Action |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Statutory Rate | Rate |  | 12.00% |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Paid, Value |  |  |  | $ 161,000,000 |  |  |  |  |  |  |  |  |
Cline Class Action | punitive damages |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Awarded, Value |  | $ 75,000,000 |  |  |  |  |  |  |  |  |  |  |
Cline Class Action | Additional Interest |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Awarded, Value |  | 23,000,000 |  |  |  |  |  |  |  |  |  |  |
Cline Class Action | Actual Damages |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Awarded, Value |  | $ 104,000,000 |  |  |  |  |  |  |  |  |  |  |
Cline Class Action | Actual Damages |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Awarded, Value |  |  |  |  |  | $ 81,000,000 | $ 75,000,000 |  |  |  |  |  |
Cline Class Action | punitive damages |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Awarded, Value |  |  |  |  |  |  | $ 75,000,000 |  |  |  |  |  |
Rover - FERC Stoneman House | Pending Litigation |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Sought, Value |  |  |  |  |  |  |  |  |  |  | 20,000,000 |  |
Massachusetts Attorney General v. New England Gas Company | Legal Fees |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Sought, Value |  |  |  |  |  |  |  |  |  |  | 18,000,000 |  |
Linde Engineering North America Inc. | Crestwood |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Paid, Value |  |  | $ 21,000,000 |  |  |  |  |  |  |  |  |  |
Loss Contingency, Reversal of Damages Awarded, Value | $ 22,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Linde Engineering North America Inc. | Crestwood | punitive damages |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Awarded, Value | 21,000,000 |  |  |  | $ 21,000,000 |  |  |  |  |  |  |  |
Loss Contingency, Reversal of Damages Awarded, Value | 18,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Linde Engineering North America Inc. | Crestwood | other costs |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Awarded, Value |  |  |  |  | 5,000,000 |  |  |  |  |  |  |  |
Loss Contingency, Reversal of Damages Awarded, Value | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Linde Engineering North America Inc. | Crestwood | pre-judgement interest award |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Awarded, Value |  |  |  |  | $ 18,000,000 |  |  |  |  |  |  |  |
State of Oklahoma Attorney General - Winter Storm Uri |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingency, Damages Sought, Value |  |  |  |  |  |  |  |  |  |  | $ 75,000 |  |

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