ESTIMATES, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND BALANCE SHEET DETAIL Estimates, Significant Accounting Policies and Balance Sheet Detail (Tables)

12 Months Ended

Dec. 31, 2020

Summary of Significant Accounting Policies [Abstract]

Other Current Liabilities [Table Text Block]

Other Current Liabilities. Other current liabilities consisted of the following:

	December 31,
	2020		2019
Deposits from customers	$	8	$	13
Accrued expenses	13		21
Accrued capital expenditures	4		11
Current income tax payable	—		16
ARO	—		5
Other	8		9
Total other current liabilities	$	33	$	75

Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]

Non-cash investing and financing activities and supplemental cash flow information are as follows:

	Years Ended December 31,
	2020		2019		2018
Non-cash investing and financing activities:
Settlement of affiliate liability - tax payable	$	—	$	—	$	(19)
Settlement of affiliate liability - related company payables	(4)		—		(12)
Contribution of assets from affiliate	—		—		(7)
Distribution of non-cash assets to parent	—		—		68
Supplemental cash flow information:
Accrued capital expenditures	$	4	$	11	$	13
Cash paid for interest, net of interest capitalized	16		23		43
Cash paid for interest on note payable to related company	33		23		13

Property, Plant and Equipment [Table Text Block]

		December 31,
	Lives in Years	2020		2019
Land and improvements		$	4	$	4
Buildings and improvements	6 – 46	197		194
Pipelines and equipment	5 – 46	2,631		2,556
Natural gas storage facilities	26 – 46	360		348
Other	3 – 21	142		139
Construction work in progress		15		40
Property, plant and equipment		3,349		3,281
Accumulated depreciation and amortization		(717)		(607)
Property, plant and equipment, net		$	2,632	$	2,674

Schedule of Inventory, Current [Table Text Block]

The following table presents the components of inventory:

	December 31,
	2020		2019
Natural gas (1)	$	63	$	39
Materials and supplies	23		22
	$	86	$	61

(1)Natural gas volumes held for operations at December 31, 2020 and 2019 were 29.2 TBtu and 19.3 TBtu, respectively.

Revenue from External Customers by Products and Services [Table Text Block]

The following table presents the relative contribution to the Company’s total operating revenue from operations of each customer that comprised at least 10% of its operating revenues:

	Years Ended December 31,
	2020		2019		2018
Customer A	12	%	10	%	10	%
Customer B	17		16		16
Other top 10 customers	31		31		28
Remaining customers	40		43		46
Total percentage	100	%	100	%	100	%

Other Noncurrent Liabilities [Table Text Block]

Other Non-Current Liabilities. Other non-current liabilities consisted of the following:

	December 31,
	2020		2019
Pension liability	$	97	$	103
ARO	37		30
Other	109		88
Total other non-current liabilities	$	243	$	221