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Contingencies (Details) - USD ($) $ in Millions | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
May 31, 2026 | Apr. 30, 2026 | Jun. 30, 2026 | Jun. 30, 2025 | Dec. 31, 2025
Loss Contingencies [Line Items] |  |  |  |  |
Accrued environmental loss liabilities |  |  | $ 37 |  |
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] |  |  | Other Liabilities and Deferred Revenue, Noncurrent, Other current liabilities |  |
Other current liabilities |  |  | $ 1,518 |  | $ 1,639
Transcontinental Gas Pipe Line Company, LLC [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Deferred Revenue, Refund Payments |  | $ 221 |  |  |
Regulatory Assets, Current |  |  | 146 |  | 126
Other current liabilities |  |  | 204 |  | 143
Transcontinental Gas Pipe Line Company, LLC [Member] | Environmental Restoration Costs |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Accrued environmental loss liabilities |  |  | $ 10 |  |
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] |  |  | Other current liabilities, Other Liabilities, Noncurrent |  |
Transcontinental Gas Pipe Line Company, LLC [Member] | Potentially Responsible Party At Various Superfund And State Waste Disposal Sites | Maximum [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Accrual for Environmental Loss Contingencies, Gross |  |  | $ 1 |  |
Northwest Pipeline LLC [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Regulatory Assets, Current |  |  | 4 |  | 3
Other current liabilities |  |  | 39 |  | 32
Northwest Pipeline LLC [Member] | Environmental Restoration Costs |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Accrued environmental loss liabilities |  |  | $ 1 |  |
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] |  |  | Other current liabilities, Other Liabilities, Noncurrent |  |
Northwest Pipeline LLC [Member] | Washington State Climate Commitment Act |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Regulatory Assets, Current |  |  | $ 86 |  | 72
Other current liabilities |  |  | 4 |  | $ 6
Interest Income, Other |  |  | 2 | $ 2 |
Gas Pipeline [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Accrued environmental loss liabilities |  |  | 11 |  |
Unrecorded Estimated Recoveries For Environmental Loss Contingencies |  |  | 3 |  |
Natural Gas Underground Storage Facilities [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Accrued environmental loss liabilities |  |  | 7 |  |
Former Operations [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Accrued environmental loss liabilities |  |  | $ 19 |  |
Construction Project | Transcontinental Gas Pipe Line Company, LLC [Member] |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Litigation Settlement, Amount Awarded from Other Party | $ 22 |  |  |  |

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