CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
OPERATING REVENUES
Operating revenues	$ 6,247	$ 6,557	$ 6,676
Operating revenues - affiliates	2,663	2,407	2,162
Total operating revenues	8,910	8,964	8,838
OPERATING EXPENSES
Cost of services and products (exclusive of depreciation and amortization)	2,934	2,872	2,879
Selling, general and administrative	1,022	1,015	1,086
Operating expenses - affiliates	941	960	756
Depreciation and amortization	1,691	1,857	2,005
Total operating expenses	6,588	6,704	6,726
OPERATING INCOME	2,322	2,260	2,112
OTHER (EXPENSE) INCOME
Interest expense	(478)	(473)	(464)
Interest expense - affiliates, net	(59)	(53)	(40)
Other (expense) income, net	(22)	(1)	1
Total other expense, net	(559)	(527)	(503)
INCOME BEFORE INCOME TAX EXPENSE	1,763	1,733	1,609
Income tax expense	678	659	639
NET INCOME	$ 1,085	$ 1,074	$ 970