CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
OPERATING REVENUE
Total operating revenue	$ 2,039	$ 2,149	$ 6,145	$ 6,380
OPERATING EXPENSES
Cost of services and products (exclusive of depreciation and amortization)	630	697	1,825	2,106
Selling, general and administrative	131	172	445	602
Operating expenses - affiliates	186	203	600	616
Depreciation and amortization	344	360	1,017	1,081
Total operating expenses	1,291	1,432	3,887	4,405
OPERATING INCOME	748	717	2,258	1,975
OTHER (EXPENSE) INCOME
Interest expense	(95)	(112)	(286)	(350)
Interest expense - affiliates, net	(15)	(15)	(46)	(42)
Other income, net	5	(26)	19	(1)
Total other expense, net	(105)	(153)	(313)	(393)
INCOME BEFORE INCOME TAXES	643	564	1,945	1,582
Income tax expense	166	111	504	322
NET INCOME	477	453	1,441	1,260
Non-affiliate services
OPERATING REVENUE
Total operating revenue	1,338	1,397	4,002	4,209
Affiliate Services
OPERATING REVENUE
Total operating revenue	$ 701	$ 752	$ 2,143	$ 2,171