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Fair Value Measurements and Guarantees Recurring Measurements and Additional (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Energy Related Derivative |  |  |
Measured on a recurring basis |  |  |
Derivative Asset |  | $ 265 | $ 344
Derivative Liability |  | (336) | (400)
Carrying Amount [Member] |  |  |
Additional disclosures: |  |  |
Guarantees |  | (35) | (36)
Long-term debt, including current portion |  | (28,572) | (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 |  | (22,394) | (20,167)
Carrying Amount [Member] | Transcontinental Gas Pipe Line Company, LLC [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | (5,221) | (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 |  | (374) | (372)
Fair Value [Member] |  |  |
Additional disclosures: |  |  |
Guarantees |  | (28) | (28)
Long-term debt, including current portion |  | (28,147) | (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 |  | (21,941) | (19,517)
Fair Value [Member] | Transcontinental Gas Pipe Line Company, LLC [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | (5,254) | (5,276)
Fair Value [Member] | Northwest Pipeline LLC [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | (579) | (573)
Fair Value [Member] | MountainWest [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | (373) | (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 |  | (28,147) | (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 |  | (21,941) | (19,517)
Level 2 [Member] | Transcontinental Gas Pipe Line Company, LLC [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | (5,254) | (5,276)
Level 2 [Member] | Northwest Pipeline LLC [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | (579) | (573)
Level 2 [Member] | MountainWest [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | (373) | (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] | 265 | 344
Derivative Liability | [1] | (336) | (400)
Fair Value, Recurring [Member] | Carrying Amount [Member] | Transcontinental Gas Pipe Line Company, LLC [Member] |  |  |
Measured on a recurring basis |  |  |
ARO Trust investments |  | 323 | 297
Fair Value, Recurring [Member] | Fair Value [Member] |  |  |
Measured on a recurring basis |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 609 | 726
Derivative Liability, Fair Value, Gross Liability |  | (949) | (1,070)
Fair Value, Recurring [Member] | Fair Value [Member] | Transcontinental Gas Pipe Line Company, LLC [Member] |  |  |
Measured on a recurring basis |  |  |
ARO Trust investments |  | 323 | 297
Fair Value, Recurring [Member] | Level 1 [Member] |  |  |
Measured on a recurring basis |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 421 | 427
Derivative Liability, Fair Value, Gross Liability |  | (522) | (532)
Fair Value, Recurring [Member] | Level 1 [Member] | Transcontinental Gas Pipe Line Company, LLC [Member] |  |  |
Measured on a recurring basis |  |  |
ARO Trust investments |  | 323 | 297
Fair Value, Recurring [Member] | Level 2 [Member] |  |  |
Measured on a recurring basis |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 136 | 188
Derivative Liability, Fair Value, Gross Liability |  | (380) | (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 |  | 52 | 111
Derivative Liability, Fair Value, Gross Liability |  | (47) | (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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