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

12 Months Ended

Dec. 31, 2019

Summary of Significant Accounting Policies [Abstract]

Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]

Cumulative-effect adjustments made to the opening balance sheet at January 1, 2019 were as follows:

	Balance at December 31, 2018, as previously reported		Adjustments due to Topic 842 (Leases)		Balance at January 1, 2019
Assets:
Operating lease right-of-use assets	$	—	$	6	$	6
Liabilities:
Non-current operating lease liabilities	—		6		6

Other Current Liabilities [Table Text Block]

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

	December 31,
	2019		2018
Deposits from customers	$	13	$	25
Accrued expenses	21		24
Accrued capital expenditures	11		13
Current income tax payable	16		—
Other	9		7
Total other current liabilities	$	70	$	69

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,
	2019		2018			2017
Non-cash investing and financing activities:
Settlement of affiliate liability - tax payable	$	—	$	(19	)	$	(8	)
Settlement of affiliate liability - related party payables	—		(12		)	—
Contribution of assets from affiliate	—		(7		)	—
Distribution of non-cash assets to parent	—		68			—
Supplemental cash flow information:
Accrued capital expenditures	$	11	$	13		$	11
Cash paid for interest, net of interest capitalized	23		43			75
Cash received for interest on note receivable from affiliate	—		—			18
Cash paid for interest on note payable to affiliate	23		13			—

Property, Plant and Equipment [Table Text Block]

		December 31,
	Lives in Years	2019			2018
Land and improvements		$	4		$	3
Buildings and improvements	6 – 46	194			158
Pipelines and equipment	5 – 46	2,556			2,556
Natural gas storage facilities	26 – 46	348			282
Other	3 – 21	139			160
Construction work in progress		40			37
Property, plant and equipment		3,281			3,196
Accumulated depreciation and amortization		(607		)	(507		)
Property, plant and equipment, net		$	2,674		$	2,689

Schedule of Inventory, Current [Table Text Block]

The following table presents the components of inventory:

	December 31,
	2019		2018
Natural gas (1)	$	39	$	79
Materials and supplies	22		19
	$	61	$	98

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Natural gas volumes held for operations at December 31, 2019 and 2018 were 19.3 TBtu and 25.9 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 continuing operations of each customer that comprised at least 10% of its operating revenues:

	Years Ended December 31,
	2019		2018		2017
Customer A	10	%	10	%	13	%
Customer B	16		16		—
Other top 10 customers	31		28		41
Remaining customers	43		46		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,
	2019		2018
Pension liability	$	103	$	117
ARO	30		26
Other	88		90
Total other non-current liabilities	$	221	$	233