CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement
Other Nonoperating Income (Expense)	$ (7)	$ 0
OPERATING REVENUES:
Total operating revenues	144	158
OPERATING EXPENSES:
Operating and maintenance	50	47
General and administrative	10	6
Depreciation and amortization	26	29
Total operating expenses	86	82
OPERATING INCOME	58	76
OTHER INCOME (EXPENSE):
Interest expense, net	(4)	(5)
Interest Expense, Related Party	(9)	(4)
INCOME BEFORE INCOME TAX (BENEFIT) EXPENSE	38	67
Income tax expense	(2)	17
NET INCOME	40	50
OTHER COMPREHENSIVE INCOME, NET OF TAX
Actuarial gain relating to postretirement benefit plans	5	6
COMPREHENSIVE INCOME	45	56
Natural Gas, US Regulated [Member]
OPERATING REVENUES:
Transportation and storage of natural gas	139	152
Product and Service, Other [Member]
OPERATING REVENUES:
Transportation and storage of natural gas	$ 5	$ 6