CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
OPERATING REVENUE
Total operating revenue	$ 8,157	$ 8,493	$ 8,550
OPERATING EXPENSES
Cost of services and products (exclusive of depreciation and amortization)	2,438	2,767	2,881
Selling, general and administrative	659	799	925
Operating expenses - affiliates	812	831	848
Depreciation and amortization	1,364	1,436	1,583
Total operating expenses	5,273	5,833	6,237
OPERATING INCOME	2,884	2,660	2,313
OTHER (EXPENSE) INCOME
Interest expense	(380)	(448)	(465)
Interest expense - affiliates, net	(62)	(57)	(63)
Other income, net	26	4	6
Total other expense, net	(416)	(501)	(522)
INCOME BEFORE INCOME TAXES	2,468	2,159	1,791
Income tax expense	641	494	134
NET INCOME	1,827	1,665	1,657
Non-Affiliate Services
OPERATING REVENUE
Total operating revenue	5,284	5,558	5,831
Affiliate services
OPERATING REVENUE
Total operating revenue	$ 2,873	$ 2,935	$ 2,719