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Fair Value Measurements Nonrecurring Measurements (Details) - Williams Companies Inc [Member] - Level 2 [Member] - West [Member] $ in Millions	3 Months Ended
	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

X

- Definition

Fair value portion of assets classified as held for sale.

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The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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