CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
OPERATING REVENUE
Total operating revenue	$ 2,051	$ 2,101	$ 4,106	$ 4,231
OPERATING EXPENSES
Cost of services and products (exclusive of depreciation and amortization)	588	702	1,195	1,409
Selling, general and administrative	157	215	314	430
Operating expenses - affiliates	219	197	414	413
Depreciation and amortization	337	361	673	721
Total operating expenses	1,301	1,475	2,596	2,973
OPERATING INCOME	750	626	1,510	1,258
OTHER (EXPENSE) INCOME
Interest expense	(96)	(120)	(191)	(238)
Interest expense - affiliates, net	(15)	(14)	(31)	(27)
Other income, net	5	16	14	25
Total other expense, net	(106)	(118)	(208)	(240)
INCOME BEFORE INCOME TAXES	644	508	1,302	1,018
Income tax expense	167	81	338	211
NET INCOME	477	427	964	807
Non-affiliate services
OPERATING REVENUE
Total operating revenue	1,331	1,393	2,664	2,812
Affiliate Services
OPERATING REVENUE
Total operating revenue	$ 720	$ 708	$ 1,442	$ 1,419