CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
OPERATING REVENUES
Operating revenues	$ 6,557	$ 6,676	$ 6,818
Operating revenues - affiliates	2,407	2,162	1,935
Total operating revenues	8,964	8,838	8,753
OPERATING EXPENSES
Cost of services and products (exclusive of depreciation and amortization)	2,872	2,879	2,790
Selling, general and administrative	1,015	1,086	1,062
Operating expenses - affiliates	960	756	695
Depreciation and amortization	1,857	2,005	2,128
Total operating expenses	6,704	6,726	6,675
OPERATING INCOME	2,260	2,112	2,078
OTHER (EXPENSE) INCOME
Interest expense	(473)	(464)	(450)
Interest expense - affiliates, net	(53)	(40)	(64)
Other (expense) income, net	(1)	1	2
Total other expense, net	(527)	(503)	(512)
INCOME BEFORE INCOME TAX EXPENSE	1,733	1,609	1,566
Income tax expense	659	639	602
NET INCOME	$ 1,074	$ 970	$ 964