CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
OPERATING REVENUE
Total operating revenue	$ 1,801	$ 2,011	$ 5,518	$ 6,069
OPERATING EXPENSES
Cost of services and products (exclusive of depreciation and amortization)	528	602	1,491	1,749
Selling, general and administrative	128	131	410	445
Operating expenses - affiliates	198	186	557	600
Depreciation and amortization	330	344	985	1,017
Total operating expenses	1,184	1,263	3,443	3,811
OPERATING INCOME	617	748	2,075	2,258
OTHER (EXPENSE) INCOME
Interest expense	(69)	(95)	(219)	(286)
Interest expense - affiliates, net	(18)	(15)	(50)	(46)
Other (expense) income, net	(18)	5	(31)	19
Total other expense, net	(105)	(105)	(300)	(313)
INCOME BEFORE INCOME TAXES	512	643	1,775	1,945
Income tax expense	133	166	463	504
NET INCOME	379	477	1,312	1,441
Non-affiliate services
OPERATING REVENUE
Total operating revenue	1,200	1,310	3,642	3,926
Affiliate services
OPERATING REVENUE
Total operating revenue	$ 601	$ 701	$ 1,876	$ 2,143