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Fair Value Measurements and Guarantees Recurring Measurements and Additional (Details) - USD ($) $ in Millions | Jun. 30, 2026 | Dec. 31, 2025
--- | --- | ---
Energy Related Derivative |  |  |
Measured on a recurring basis |  |  |
Derivative Asset |  | $ 266 | $ 336
Derivative Liability |  | (309) | (340)
Carrying Amount [Member] |  |  |
Additional disclosures: |  |  |
Guarantees |  | (34) | (35)
Long-term debt, including current portion |  | (30,318) | (28,661)
Carrying Amount [Member] | Williams Companies Inc [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | (23,300) | (21,649)
Carrying Amount [Member] | Transcontinental Gas Pipe Line Company, LLC [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | (5,890) | (5,888)
Carrying Amount [Member] | Northwest Pipeline LLC [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | (749) | (748)
Carrying Amount [Member] | MountainWest [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | (379) | (376)
Fair Value [Member] |  |  |
Additional disclosures: |  |  |
Guarantees |  | (26) | (28)
Long-term debt, including current portion |  | (29,835) | (28,629)
Fair Value [Member] | Williams Companies Inc [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | (22,875) | (21,556)
Fair Value [Member] | Transcontinental Gas Pipe Line Company, LLC [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | (5,827) | (5,941)
Fair Value [Member] | Northwest Pipeline LLC [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | (747) | (747)
Fair Value [Member] | MountainWest [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | (386) | (385)
Level 1 [Member] |  |  |
Additional disclosures: |  |  |
Guarantees |  | 0 | 0
Long-term debt, including current portion |  | 0 | 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 |  | (10) | (12)
Long-term debt, including current portion |  | (29,835) | (28,629)
Level 2 [Member] | Williams Companies Inc [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | (22,875) | (21,556)
Level 2 [Member] | Transcontinental Gas Pipe Line Company, LLC [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | (5,827) | (5,941)
Level 2 [Member] | Northwest Pipeline LLC [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | (747) | (747)
Level 2 [Member] | MountainWest [Member] |  |  |
Additional disclosures: |  |  |
Long-term debt, including current portion |  | (386) | (385)
Level 3 [Member] |  |  |
Additional disclosures: |  |  |
Guarantees |  | (16) | (16)
Long-term debt, including current portion |  | 0 | 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] |  |  |
Measured on a recurring basis |  |  |
Equity Securities |  | 123 |
Fair Value, Recurring [Member] | Carrying Amount [Member] | Energy Related Derivative |  |  |
Measured on a recurring basis |  |  |
Derivative Asset | [1] | 266 | 336
Derivative Liability | [1] | (309) | (340)
Fair Value, Recurring [Member] | Carrying Amount [Member] | Transcontinental Gas Pipe Line Company, LLC [Member] |  |  |
Measured on a recurring basis |  |  |
ARO Trust investments |  | 321 | 356
Fair Value, Recurring [Member] | Fair Value [Member] |  |  |
Measured on a recurring basis |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 631 | 722
Derivative Liability, Fair Value, Gross Liability |  | (919) | (915)
Equity Securities |  | 123 |
Fair Value, Recurring [Member] | Fair Value [Member] | Transcontinental Gas Pipe Line Company, LLC [Member] |  |  |
Measured on a recurring basis |  |  |
ARO Trust investments |  | 321 | 356
Fair Value, Recurring [Member] | Level 1 [Member] |  |  |
Measured on a recurring basis |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 392 | 431
Derivative Liability, Fair Value, Gross Liability |  | (536) | (497)
Equity Securities |  | 123 |
Fair Value, Recurring [Member] | Level 1 [Member] | Transcontinental Gas Pipe Line Company, LLC [Member] |  |  |
Measured on a recurring basis |  |  |
ARO Trust investments |  | 321 | 356
Fair Value, Recurring [Member] | Level 2 [Member] |  |  |
Measured on a recurring basis |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 98 | 158
Derivative Liability, Fair Value, Gross Liability |  | (213) | (270)
Equity Securities |  | 0 |
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 |  | 141 | 133
Derivative Liability, Fair Value, Gross Liability |  | (170) | (148)
Equity Securities |  | 0 |
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 |  | 20 |
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 8 – Commodity Derivatives)

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