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v3.25.3

Contingencies and Commitments (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Loss Contingencies [Line Items] |  |  |  |  |  |
Accrued environmental loss liabilities |  | $ 42 |  | $ 42 |  |
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] |  | Other Liabilities and Deferred Revenue, Noncurrent, Other current liabilities |  | Other Liabilities and Deferred Revenue, Noncurrent, Other current liabilities |  |
Other current liabilities |  | $ 1,472 |  | $ 1,472 |  | $ 1,360
Transcontinental Gas Pipe Line Company, LLC [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Regulatory Assets, Current |  | 121 |  | 121 |  | 74
Other current liabilities |  | 93 |  | 93 |  | 78
Interest Income, Other |  | 8 | $ 14 | 23 | $ 47 |
Transcontinental Gas Pipe Line Company, LLC [Member] | Environmental Restoration Costs |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Accrued environmental loss liabilities |  | $ 10 |  | $ 10 |  |
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] |  | Other current liabilities, Other Liabilities, Noncurrent |  | 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 |  | $ 1 |  |
Northwest Pipeline LLC [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Regulatory Assets, Current |  | 3 |  | 3 |  | 6
Other current liabilities |  | 22 |  | 22 |  | 18
Interest Income, Other |  |  |  | 2 | $ 1 |
Northwest Pipeline LLC [Member] | Environmental Restoration Costs |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Accrued environmental loss liabilities |  | $ 1 |  | $ 1 |  |
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] |  | Other current liabilities, Other Liabilities, Noncurrent |  | Other current liabilities, Other Liabilities, Noncurrent |  |
Northwest Pipeline LLC [Member] | Washington State Climate Commitment Act |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Regulatory Assets, Current |  | $ 62 |  | $ 62 |  | 38
Other current liabilities |  | 5 |  | 5 |  | $ 3
Capital Addition Purchase Commitments [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Commitments for construction and acquisition of property, plant, and equipment |  | 1,100 |  | 1,100 |  |
Capital Addition Purchase Commitments [Member] | Transcontinental Gas Pipe Line Company, LLC [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Commitments for construction and acquisition of property, plant, and equipment |  | 317 |  | 317 |  |
Capital Addition Purchase Commitments [Member] | Northwest Pipeline LLC [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Commitments for construction and acquisition of property, plant, and equipment |  | 55 |  | 55 |  |
Gas Pipeline [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Accrued environmental loss liabilities |  | 11 |  | 11 |  |
Recoverable through rates [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Accrued environmental loss liabilities |  | 3 |  | 3 |  |
Natural Gas Underground Storage Facilities [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Accrued environmental loss liabilities |  | 8 |  | 8 |  |
Former Operations [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Accrued environmental loss liabilities |  | $ 23 |  | $ 23 |  |
Construction Project | Transcontinental Gas Pipe Line Company, LLC [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Litigation Settlement, Amount Awarded to Other Party | $ 110 |  |  |  |  |
Loss Contingency Expected Recovery Percentage | 29.00% |  |  |  |  |

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