Employee Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Regulatory liabilities	$ 388,433	$ 355,725
Regulatory Liabilities	388,465	358,957
Salary and Wage, Excluding Cost of Good and Service Sold [Abstract]
Stock-based compensation expense	1,200	1,300	$ 1,500
Other Postretirement Benefit Costs
Defined Benefit Plan Disclosure [Line Items]
Regulatory liabilities	41,000	39,400
Williams Companies Inc [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension cost	800	1,900	2,200
Defined contribution plan matching contributions expense	2,700	2,300	1,800
Williams Companies Inc [Member] | Retiree health care and life insurance benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Regulatory liabilities	1,600	$ 1,700	$ 1,500
Williams Companies Inc [Member] | Pension Plan [Member] | Directly charged [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension cost charges to us by Williams	$ 700