CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
OPERATING REVENUES:
Transportation and storage of natural gas	$ 131	$ 100	$ 273	$ 223
Other	3	4	10	9
Total operating revenues	134	104	283	232
OPERATING EXPENSES:
Cost of natural gas and other energy	1	1	2	2
Operating and maintenance	54	46	101	97
General and administrative	9	7	18	17
Depreciation and amortization	30	32	60	63
Total operating expenses	94	86	181	179
OPERATING INCOME	40	18	102	53
OTHER INCOME (EXPENSE):
Interest expense, net	(8)	(11)	(18)	(23)
Interest Expense, Related Party	(2)	0	(3)	0
Interest income - affiliates	0	4	0	8
Other, net	1	2	2	1
INCOME BEFORE INCOME TAX EXPENSE	31	13	83	39
Income tax expense	9	5	27	17
NET INCOME	22	8	56	22
OTHER COMPREHENSIVE LOSS, NET OF TAX
Actuarial loss relating to postretirement benefit plans	0	0	(1)	0
COMPREHENSIVE INCOME	$ 22	$ 8	$ 55	$ 22