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Fair Value Measurements Nonrecurring Measurements (Details) - Williams Companies Inc [Member] - Level 2 [Member] - West [Member] $ in Millions | 3 Months Ended
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Dec. 31, 2025 USD ($)
Fair Value, Nonrecurring [Member] |
Fair Value Assets Measured On Nonrecurring Basis [Abstract] |
Long-Lived Asset, Held-for-Sale, Fair Value Disclosure | $ 48
Income Statement Location [Axis]: us-gaap:OtherAssetImpairmentCharges |
Fair Value Assets Measured On Nonrecurring Basis [Abstract] |
Impairment of Long-Lived Assets to be Disposed of | $ 176

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