Statement of Net Income (Unaudited) - NWP - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Revenues [Abstract]
Revenues	$ 3,048	$ 2,771
Costs and Expenses [Abstract]
Other Operating Income (Expense), Net	(10)	(17)
Operating income (loss)	1,094	1,012
Interest expense	(349)	(349)
Other Nonoperating Income (Expense)	14	31
Net income (loss) attributable to The Williams Companies, Inc.	691	632
Northwest Pipeline LLC [Member]
Revenues [Abstract]
Revenues	111	117
Costs and Expenses [Abstract]
Utilities Operating Expense, Maintenance and Operations	21	22
General and Administrative Expense	13	12
Depreciation and amortization expenses	29	27
Taxes, Miscellaneous	4	3
Other Operating Income (Expense), Net	(6)	(3)
Operating Expenses	61	61
Operating income (loss)	50	56
Interest expense	(7)	(7)
Public Utilities, Allowance for Funds Used During Construction, Additions	2	2
Other Nonoperating Income (Expense)	1	2
Net income (loss) attributable to The Williams Companies, Inc.	46	53
Natural Gas, US Regulated | Northwest Pipeline LLC [Member]
Revenues [Abstract]
Revenues	105	110
Natural Gas, Storage | Northwest Pipeline LLC [Member]
Revenues [Abstract]
Revenues	4	4
Product and Service, Other | Northwest Pipeline LLC [Member]
Revenues [Abstract]
Revenues	$ 2	$ 3