CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
OPERATING REVENUES:
Transportation and storage of natural gas	$ 142	$ 123
Other	7	5
Total operating revenues	149	128
OPERATING EXPENSES:
Cost of natural gas and other energy	1	1
Operating and maintenance	47	51
General and administrative	9	10
Depreciation and amortization	30	31
Total operating expenses	87	93
OPERATING INCOME	62	35
OTHER INCOME (EXPENSE):
Interest expense, net	(11)	(12)
Interest income - affiliates	0	4
Other, net	1	(1)
INCOME BEFORE INCOME TAX EXPENSE	52	26
Income tax expense	18	12
NET INCOME	34	14
OTHER COMPREHENSIVE LOSS, NET OF TAX
Actuarial loss relating to postretirement benefit plans	(1)	0
COMPREHENSIVE INCOME	$ 33	$ 14