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Fair Value Measurements and Guarantees Recurring Measurements and Additional (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Energy Related Derivative |  |  |
Measured on a recurring basis |  |  |
Derivative Asset |  | $ 231 | $ 344
Derivative Liability |  | (308) | (400)
Carrying Amount [Member] |  |  |
Additional disclosures: |  |  |
Guarantees |  | (35) | (36)
Long-term debt, including current portion |  | (27,817) | (26,456)
Carrying Amount [Member] | Gulf Coast Storage Acquisition |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  |  | (100)
Carrying Amount [Member] | Williams Companies Inc [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | (21,645) | (20,167)
Carrying Amount [Member] | Transcontinental Gas Pipe Line Company, LLC [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | (5,214) | (5,235)
Carrying Amount [Member] | Northwest Pipeline LLC [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | (583) | (582)
Carrying Amount [Member] | MountainWest [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | (375) | (372)
Fair Value [Member] |  |  |
Additional disclosures: |  |  |
Guarantees |  | (28) | (28)
Long-term debt, including current portion |  | (27,748) | (25,830)
Fair Value [Member] | Gulf Coast Storage Acquisition |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  |  | (100)
Fair Value [Member] | Williams Companies Inc [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | (21,503) | (19,517)
Fair Value [Member] | Transcontinental Gas Pipe Line Company, LLC [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | (5,282) | (5,276)
Fair Value [Member] | Northwest Pipeline LLC [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | (581) | (573)
Fair Value [Member] | MountainWest [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | (382) | (364)
Level 1 [Member] |  |  |
Additional disclosures: |  |  |
Guarantees |  | 0 | 0
Long-term debt, including current portion |  | 0 | 0
Level 1 [Member] | Gulf Coast Storage Acquisition |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  |  | 0
Level 1 [Member] | Williams Companies Inc [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | 0 | 0
Level 1 [Member] | Transcontinental Gas Pipe Line Company, LLC [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | 0 | 0
Level 1 [Member] | Northwest Pipeline LLC [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | 0 | 0
Level 1 [Member] | MountainWest [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | 0 | 0
Level 2 [Member] |  |  |
Additional disclosures: |  |  |
Guarantees |  | (12) | (12)
Long-term debt, including current portion |  | (27,748) | (25,830)
Level 2 [Member] | Gulf Coast Storage Acquisition |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  |  | (100)
Level 2 [Member] | Williams Companies Inc [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | (21,503) | (19,517)
Level 2 [Member] | Transcontinental Gas Pipe Line Company, LLC [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | (5,282) | (5,276)
Level 2 [Member] | Northwest Pipeline LLC [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | (581) | (573)
Level 2 [Member] | MountainWest [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | (382) | (364)
Level 3 [Member] |  |  |
Additional disclosures: |  |  |
Guarantees |  | (16) | (16)
Long-term debt, including current portion |  | 0 | 0
Level 3 [Member] | Gulf Coast Storage Acquisition |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  |  | 0
Level 3 [Member] | Williams Companies Inc [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | 0 | 0
Level 3 [Member] | Transcontinental Gas Pipe Line Company, LLC [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | 0 | 0
Level 3 [Member] | Northwest Pipeline LLC [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | 0 | 0
Level 3 [Member] | MountainWest [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | 0 | 0
Fair Value, Recurring [Member] | Carrying Amount [Member] | Energy Related Derivative |  |  |
Measured on a recurring basis |  |  |
Derivative Asset | [1] | 231 | 344
Derivative Liability | [1] | (308) | (400)
Fair Value, Recurring [Member] | Carrying Amount [Member] | Transcontinental Gas Pipe Line Company, LLC [Member] |  |  |
Measured on a recurring basis |  |  |
ARO Trust investments |  | 346 | 297
Fair Value, Recurring [Member] | Fair Value [Member] |  |  |
Measured on a recurring basis |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 565 | 726
Derivative Liability, Fair Value, Gross Liability |  | (853) | (1,070)
Fair Value, Recurring [Member] | Fair Value [Member] | Transcontinental Gas Pipe Line Company, LLC [Member] |  |  |
Measured on a recurring basis |  |  |
ARO Trust investments |  | 346 | 297
Fair Value, Recurring [Member] | Level 1 [Member] |  |  |
Measured on a recurring basis |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 367 | 427
Derivative Liability, Fair Value, Gross Liability |  | (459) | (532)
Fair Value, Recurring [Member] | Level 1 [Member] | Transcontinental Gas Pipe Line Company, LLC [Member] |  |  |
Measured on a recurring basis |  |  |
ARO Trust investments |  | 346 | 297
Fair Value, Recurring [Member] | Level 2 [Member] |  |  |
Measured on a recurring basis |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 133 | 188
Derivative Liability, Fair Value, Gross Liability |  | (337) | (475)
Fair Value, Recurring [Member] | Level 2 [Member] | Transcontinental Gas Pipe Line Company, LLC [Member] |  |  |
Measured on a recurring basis |  |  |
ARO Trust investments |  | 0 | 0
Fair Value, Recurring [Member] | Level 3 [Member] |  |  |
Measured on a recurring basis |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 65 | 111
Derivative Liability, Fair Value, Gross Liability |  | (57) | (63)
Fair Value, Recurring [Member] | Level 3 [Member] | Transcontinental Gas Pipe Line Company, LLC [Member] |  |  |
Measured on a recurring basis |  |  |
ARO Trust investments |  | 0 | $ 0
Wiltel Guarantee [Member] |  |  |
Additional disclosures: |  |  |
Guarantor Obligations, Maximum Exposure, Undiscounted |  | 21 |
Indemnification Agreement [Member] | Carrying Amount [Member] |  |  |
Additional disclosures: |  |  |
Guarantees |  | $ 0 |
[1] | The carrying amount is presented net of counterparty offsetting arrangements and collateral (see Note 9 – Commodity Derivatives)

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