CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
OPERATING REVENUES
Operating revenues	$ 1,456	$ 1,554	$ 4,406	$ 4,726
Operating revenues - affiliates	685	672	2,030	1,976
Total operating revenues	2,141	2,226	6,436	6,702
OPERATING EXPENSES
Cost of services and products (exclusive of depreciation and amortization)	742	757	2,185	2,196
Selling, general and administrative	231	232	710	717
Operating expenses - affiliates	211	237	647	719
Depreciation and amortization	397	424	1,181	1,267
Total operating expenses	1,581	1,650	4,723	4,899
OPERATING INCOME	560	576	1,713	1,803
OTHER (EXPENSE) INCOME
Interest expense	(117)	(121)	(348)	(362)
Interest expense - affiliates, net	(16)	(15)	(47)	(44)
Other income (expense), net	6	(26)	5	(24)
Total other expense, net	(127)	(162)	(390)	(430)
INCOME BEFORE INCOME TAX EXPENSE	433	414	1,323	1,373
Income tax expense	168	159	512	526
NET INCOME	$ 265	$ 255	$ 811	$ 847