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v3.25.2

Related Party Transactions - Transco and NWP (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2025 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Related Party Transaction [Line Items] |  |  |  |  |  |
Accounts payable |  | $ 1,414 |  | $ 1,414 |  | $ 1,613
Related Party Transaction, Rate |  |  |  | 4.00% |  |
Revenues |  | 2,781 | $ 2,336 | $ 5,829 | $ 5,107 |
Transcontinental Gas Pipe Line Company, LLC [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Interest Income, Other |  | 7 | 15 | 15 | 33 |
Revenues |  | 791 | 710 | 1,561 | 1,442 |
Credit To Expenses From Affiliates |  | 0 | 3 | 0 | 6 |
Cash distributions to parent |  |  |  | 606 | 650 |
Transcontinental Gas Pipe Line Company, LLC [Member] | Affiliated Entity |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Interest Income, Other |  | 6 | 14 | 12 | 30 |
Revenues |  | 22 | 18 | 42 | 37 |
Related Party Transaction, Purchases from Related Party |  | 3 | 1 | 5 | 3 |
Operating Expenses |  | 82 | 75 | 174 | 160 |
Transcontinental Gas Pipe Line Company, LLC [Member] | Affiliated Entity | Subsequent Event [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Cash distributions to parent | $ 301 |  |  |  |  |
Northwest Pipeline LLC [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Interest Income, Other |  |  |  | 2 | 1 |
Revenues |  | 113 | 105 | 224 | 222 |
Cash distributions to parent |  |  |  | 64 | 76 |
Northwest Pipeline LLC [Member] | Affiliated Entity |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Accounts payable |  | 0 |  | 0 |  | $ 26
Interest Income, Other |  | 1 | 2 | 1 | 4 |
Operating Expenses |  | $ 21 | $ 21 | $ 45 | $ 43 |
Northwest Pipeline LLC [Member] | Affiliated Entity | Subsequent Event [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Cash distributions to parent | 42 |  |  |  |  |
Williams Companies Inc [Member] | Affiliated Entity | Subsequent Event [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Cash distributions to parent | $ 50 |  |  |  |  |

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