CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
OPERATING REVENUES
Operating revenues	$ 1,464	$ 1,573	$ 2,950	$ 3,172
Operating revenues - affiliates	669	650	1,345	1,304
Total operating revenues	2,133	2,223	4,295	4,476
OPERATING EXPENSES
Cost of services and products (exclusive of depreciation and amortization)	723	731	1,443	1,439
Selling, general and administrative	235	235	479	485
Operating expenses - affiliates	209	231	436	482
Depreciation and amortization	393	424	784	843
Total operating expenses	1,560	1,621	3,142	3,249
OPERATING INCOME	573	602	1,153	1,227
OTHER (EXPENSE) INCOME
Interest expense	(117)	(120)	(231)	(241)
Interest expense - affiliates, net	(16)	(15)	(31)	(29)
Other (expense) income, net	(2)	0	(1)	2
Total other expense, net	(135)	(135)	(263)	(268)
INCOME BEFORE INCOME TAX EXPENSE	438	467	890	959
Income tax expense	170	179	344	367
NET INCOME	$ 268	$ 288	$ 546	$ 592