CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
OPERATING REVENUES:
Transportation and storage of natural gas	$ 123	$ 136
Other	5	5
Total operating revenues	128	141
OPERATING EXPENSES:
Cost of natural gas and other energy	1	1
Operating and maintenance	51	50
General and administrative	10	10
Depreciation and amortization	31	32
Total operating expenses	93	93
OPERATING INCOME	35	48
OTHER INCOME (EXPENSE):
Interest expense, net	(12)	(13)
Interest income - affiliates	4	7
Other, net	(1)	1
INCOME BEFORE INCOME TAX EXPENSE	26	43
Income tax expense	12	12
NET INCOME	14	31
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 14	$ 31