CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
OPERATING REVENUES
Operating revenues	$ 1,419	$ 1,486
Operating revenues - affiliates	711	676
Total operating revenues	2,130	2,162
OPERATING EXPENSES
Cost of services and products (exclusive of depreciation and amortization)	707	720
Selling, general and administrative	215	244
Operating expenses - affiliates	216	227
Depreciation and amortization	360	391
Total operating expenses	1,498	1,582
OPERATING INCOME	632	580
OTHER (EXPENSE) INCOME
Interest expense	(118)	(114)
Interest expense - affiliates, net	(13)	(15)
Other income, net	9	1
Total other expense, net	(122)	(128)
INCOME BEFORE INCOME TAX EXPENSE	510	452
Income tax expense	130	174
NET INCOME	$ 380	$ 278