Face (par) amount of debt instrument at time of issuance.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Debt and Banking Arrangements Long-Term Debt Issuances and Retirements (Details 1) - USD ($) $ in Millions	Feb. 14, 2023	Mar. 02, 2023
MountainWest
Debt Instrument [Line Items]
Liabilities, Fair Value Adjustment	$ (65)
5.40 Percent Senior Unsecured Notes Due 2026 \| Williams Companies Inc [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 750
Long-term debt interest rate		5.40%
5.65 Percent Senior Unsecured Notes Due 2033 [Member] \| Williams Companies Inc [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 750
Long-term debt interest rate		5.65%
3.53 Percent Senior Unsecured Notes due 2028 \| MountainWest
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 100
Long-term debt interest rate	3.53%
3.91 Percent Senior Unsecured Notes due 2038 \| MountainWest
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 150
Long-term debt interest rate	3.91%
4.875 Percent Senior Unsecured Notes due 2041 \| MountainWest
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 180
Long-term debt interest rate	4.875%