CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
OPERATING REVENUES:
Total operating revenues	$ 137	$ 211
OPERATING EXPENSES:
Operating and maintenance	45	40
General and administrative	10	9
Depreciation and amortization	25	26
Total operating expenses	80	75
OPERATING INCOME	57	136
OTHER INCOME (EXPENSE):
Interest expense, net	(4)	(4)
Interest expense — related company	(2)	(6)
Other, net	(1)	0
INCOME BEFORE INCOME TAX EXPENSE	50	126
Income tax expense	1	0
NET INCOME	49	126
OTHER COMPREHENSIVE INCOME, NET OF TAX:
Actuarial gain relating to postretirement benefit plans	4	6
COMPREHENSIVE INCOME	53	132
Natural Gas, US Regulated [Member]
OPERATING REVENUES:
Transportation and storage of natural gas	132	139
Product and Service, Other [Member]
OPERATING REVENUES:
Transportation and storage of natural gas	5	5
Operational Gas Sales
OPERATING REVENUES:
Transportation and storage of natural gas	$ 0	$ 67