CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
OPERATING REVENUE
Total operating revenue	$ 1,632	$ 1,724	$ 3,288	$ 3,516
OPERATING EXPENSES
Cost of services and products (exclusive of depreciation and amortization)	414	440	822	879
Selling, general and administrative	114	106	223	213
Operating expenses—affiliates	184	190	360	384
Depreciation and amortization	213	231	423	548
Total operating expenses	925	967	1,828	2,024
OPERATING INCOME	707	757	1,460	1,492
OTHER (EXPENSE) INCOME
Interest expense	(29)	(47)	(56)	(95)
Interest expense—affiliate, net	(17)	(31)	(41)	(62)
Other income (expense), net	0	2	5	(4)
Total other expense, net	(46)	(76)	(92)	(161)
INCOME BEFORE INCOME TAX EXPENSE	661	681	1,368	1,331
Income tax expense	169	172	348	340
NET INCOME	492	509	1,020	991
Non-affiliate services
OPERATING REVENUE
Total operating revenue	1,049	1,147	2,124	2,317
Affiliate Services [Member]
OPERATING REVENUE
Total operating revenue	$ 583	$ 577	$ 1,164	$ 1,199