Statement of Net Income - NWP - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Revenues [Abstract]
Revenues	$ 10,503	$ 10,907	$ 10,965
Costs and Expenses [Abstract]
Depreciation and amortization expenses	1,800	1,700	1,500
Other Operating Income (Expense), Net	(60)	(30)	28
Operating income (loss)	3,339	4,311	3,018
Interest Expense, Nonoperating	(1,364)	(1,236)	(1,147)
Other Nonoperating Income (Expense)	108	99	18
Net income (loss) attributable to The Williams Companies, Inc.	2,225	3,179	2,049
Northwest Pipeline LLC [Member]
Revenues [Abstract]
Revenues	444	440	448
Costs and Expenses [Abstract]
Utilities Operating Expense, Maintenance and Operations	95	88	84
General and Administrative Expense	51	51	52
Depreciation and amortization expenses	111	111	114
Taxes, Miscellaneous	14	12	17
Other Operating Income (Expense), Net	(18)	(16)	22
Operating Expenses	253	246	289
Operating income (loss)	191	194	159
Interest Expense, Nonoperating	(28)	(28)	(31)
Public Utilities, Allowance for Funds Used During Construction, Additions	10	4	3
Other Nonoperating Income (Expense)	7	10	6
Net income (loss) attributable to The Williams Companies, Inc.	180	180	137
Natural Gas, US Regulated | Northwest Pipeline LLC [Member]
Revenues [Abstract]
Revenues	416	415	430
Natural Gas, Storage | Northwest Pipeline LLC [Member]
Revenues [Abstract]
Revenues	15	15	13
Product and Service, Other | Northwest Pipeline LLC [Member]
Revenues [Abstract]
Revenues	$ 13	$ 10	$ 5