CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
OPERATING REVENUES:
Transportation and storage of natural gas	$ 460	$ 494	$ 525
Other	20	20	23
Total operating revenues	480	514	548
OPERATING EXPENSES:
Cost of Goods Sold	3	2	4
Operating, maintenance and general	199	209	216
General and Administrative Expense	36	39	42
Depreciation and amortization	127	130	133
Asset Impairment Charges	389	771	0
Total operating expenses	754	1,151	395
Operating Income (Loss)	(274)	(637)	153
OTHER INCOME (EXPENSE):
Interest expense, net	(46)	(49)	(50)
Interest income — affiliates	10	26	23
Other, net	2	1	31
Total other expenses, net	(34)	(22)	4
Income (Loss) from Continuing Operations Before Income Tax Expense	(308)	(659)	157
Income tax expense (benefit)	(263)	(13)	52
Net Income (Loss)	(45)	(646)	105
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	(10)	3	2
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ (53)	$ (643)	$ 107