CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
OPERATING REVENUE
Total operating revenue	$ 1,363	$ 1,450	$ 4,144	$ 4,458
OPERATING EXPENSES
Cost of services and products (exclusive of depreciation and amortization)	389	416	1,132	1,207
Selling, general and administrative	111	118	357	362
Operating expenses—affiliates	182	225	575	600
Depreciation and amortization	183	207	557	607
Total operating expenses	865	966	2,621	2,776
OPERATING INCOME	498	484	1,523	1,682
OTHER (EXPENSE) INCOME
Interest expense, net	(11)	(23)	(44)	(75)
Other income, net	2	1	1	5
Total other expense, net	(1)	(17)	(29)	(63)
INCOME BEFORE INCOME TAX EXPENSE	497	467	1,494	1,619
Income tax expense	132	126	398	426
NET INCOME	365	341	1,096	1,193
Affiliated entity
OTHER (EXPENSE) INCOME
Interest income—affiliate, net	8	5	14	7
Non-affiliate services
OPERATING REVENUE
Total operating revenue	793	924	2,468	2,869
Affiliate services
OPERATING REVENUE
Total operating revenue	$ 570	$ 526	$ 1,676	$ 1,589