CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
OPERATING REVENUES:
Total operating revenues	$ 119	$ 113	$ 371	$ 439
OPERATING EXPENSES:
Operating and maintenance	57	54	148	141
General and administrative	10	8	29	26
Depreciation and amortization	26	26	78	78
Total operating expenses	93	88	255	245
OPERATING INCOME	26	25	116	194
OTHER INCOME (EXPENSE):
Interest expense, net	(4)	(4)	(12)	(11)
Interest expense — related company	0	(4)	(3)	(14)
Other, net	(3)	(1)	(6)	(1)
INCOME BEFORE INCOME TAX EXPENSE	19	16	95	168
Income tax expense	0	0	1	0
NET INCOME	19	16	94	168
OTHER COMPREHENSIVE INCOME, NET OF TAX:
Actuarial gain relating to postretirement benefit plans	0	0	5	6
COMPREHENSIVE INCOME	19	16	99	174
Natural Gas, US Regulated [Member]
OPERATING REVENUES:
Transportation and storage of natural gas	114	108	355	358
Product and Service, Other [Member]
OPERATING REVENUES:
Transportation and storage of natural gas	5	5	16	14
Operational Gas Sales
OPERATING REVENUES:
Transportation and storage of natural gas	$ 0	$ 0	$ 0	$ 67