CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
OPERATING REVENUE
Total operating revenue	$ 2,055	$ 2,130
OPERATING EXPENSES
Cost of services and products (exclusive of depreciation and amortization)	607	707
Selling, general and administrative	157	215
Operating expenses - affiliates	195	216
Depreciation and amortization	336	360
Total operating expenses	1,295	1,498
OPERATING INCOME	760	632
OTHER (EXPENSE) INCOME
Interest expense	(95)	(118)
Interest expense - affiliates, net	(16)	(13)
Other income, net	9	9
Total other expense, net	(102)	(122)
INCOME BEFORE INCOME TAX EXPENSE	658	510
Income tax expense	171	130
NET INCOME	487	380
Non-affiliate services
OPERATING REVENUE
Total operating revenue	1,333	1,419
Affiliate Services
OPERATING REVENUE
Total operating revenue	$ 722	$ 711