CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
OPERATING REVENUE
Total operating revenue	$ 1,467	$ 1,632	$ 3,008	$ 3,288
OPERATING EXPENSES
Cost of services and products (exclusive of depreciation and amortization)	404	414	791	822
Selling, general and administrative	116	114	244	223
Operating expenses - affiliates	184	184	375	360
Depreciation and amortization	203	213	400	423
Total operating expenses	907	925	1,810	1,828
OPERATING INCOME	560	707	1,198	1,460
OTHER (EXPENSE) INCOME
Interest expense	(25)	(29)	(52)	(56)
Other income, net	3	0	4	5
Total other expense, net	(21)	(46)	(46)	(92)
INCOME BEFORE INCOME TAX EXPENSE	539	661	1,152	1,368
Income tax expense	141	169	300	348
NET INCOME	398	492	852	1,020
Related Party | Affiliated entity
OTHER (EXPENSE) INCOME
Interest expense		(17)		(41)
Interest income	1		2
Non-affiliate services
OPERATING REVENUE
Total operating revenue	964	1,049	1,945	2,124
Affiliate services
OPERATING REVENUE
Total operating revenue	$ 503	$ 583	$ 1,063	$ 1,164