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 REVENUES:
Total operating revenues	$ 115	$ 115	$ 252	$ 326
OPERATING EXPENSES:
Operating and maintenance	46	47	91	87
General and administrative	9	9	19	18
Depreciation and amortization	27	26	52	52
Total operating expenses	82	82	162	157
OPERATING INCOME	33	33	90	169
OTHER INCOME (EXPENSE):
Interest expense, net	(4)	(3)	(8)	(7)
Interest expense — related company	(1)	(4)	(3)	(10)
Other, net	(2)	0	(3)	0
INCOME BEFORE INCOME TAX EXPENSE	26	26	76	152
Income tax expense	0	0	1	0
NET INCOME	26	26	75	152
OTHER COMPREHENSIVE INCOME, NET OF TAX:
Actuarial gain relating to postretirement benefit plans	1	0	5	6
COMPREHENSIVE INCOME	27	26	80	158
Natural Gas, US Regulated [Member]
OPERATING REVENUES:
Transportation and storage of natural gas	109	111	241	250
Product and Service, Other [Member]
OPERATING REVENUES:
Transportation and storage of natural gas	6	4	11	9
Operational Gas Sales
OPERATING REVENUES:
Transportation and storage of natural gas	$ 0	$ 0	$ 0	$ 67