CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
OPERATING REVENUES
Total operating revenues	$ 2,149	$ 2,141	$ 6,380	$ 6,436
OPERATING EXPENSES
Cost of services and products (exclusive of depreciation and amortization)	697	742	2,106	2,185
Selling, general and administrative	172	231	602	710
Operating expenses - affiliates	203	211	616	647
Depreciation and amortization	360	397	1,081	1,181
Total operating expenses	1,432	1,581	4,405	4,723
OPERATING INCOME	717	560	1,975	1,713
OTHER (EXPENSE) INCOME
Interest expense	(112)	(117)	(350)	(348)
Interest expense - affiliates, net	(15)	(16)	(42)	(47)
Net loss on early retirement of debt	(34)	0	(34)	(5)
Other income, net	8	6	33	10
Total other expense, net	(153)	(127)	(393)	(390)
INCOME BEFORE INCOME TAX EXPENSE	564	433	1,582	1,323
Income tax expense	111	168	322	512
NET INCOME	453	265	1,260	811
Non-affiliate services
OPERATING REVENUES
Total operating revenues	1,397	1,456	4,209	4,406
Affiliate services
OPERATING REVENUES
Total operating revenues	$ 752	$ 685	$ 2,171	$ 2,030