CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
OPERATING REVENUES:
Total operating revenues	$ 571	$ 547	$ 578
OPERATING EXPENSES:
Operating, maintenance and general	206	177	193
General and Administrative Expense	36	37	30
Depreciation and amortization	104	116	112
Asset Impairment Charges	0	0	12
Total operating expenses	346	330	347
Operating Income (Loss)	225	217	231
OTHER EXPENSE:
Interest expense, net	(14)	(14)	(17)
Income from unconsolidated affiliates	(17)	(32)	(25)
Other, net	1	(3)	(2)
Total other expenses, net	(30)	(49)	(44)
Income (Loss) from Continuing Operations Before Income Tax Expense	195	168	187
Income tax benefit	(1)	(3)	(402)
Net Income (Loss)	196	171	589
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax	14	21	23
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	210	192	612
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	3	6	4
Product and Service, Other [Member]
Income Statement
Revenue from Contract with Customer, Including Assessed Tax	18	19	22
Operational Gas Sales
Income Statement
Revenue from Contract with Customer, Including Assessed Tax	67	0	0
Transportation and storage of natural gas
Income Statement
Revenue from Contract with Customer, Including Assessed Tax	$ 486	$ 528	$ 556