REGULATORY ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Mar. 31, 2023	Nov. 18, 2022	Aug. 25, 2022	Feb. 28, 2021
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Assets, Current	$ 75,308	$ 275,572
Regulatory Assets, Noncurrent	287,906	330,831
Regulatory Assets	363,214	606,403
Regulatory Liability, Current	(66,901)	(47,867)
Regulatory Liability, Noncurrent	(500,478)	(529,441)
Regulatory Liabilities	(567,379)	(577,308)
Net regulatory assets (liabilities), current	8,407	227,705
Net regulatory assets (liabilities), noncurrent	(212,572)	(198,610)
Net Regulatory Assets	(204,165)	29,095
February 2021 Natural Gas Purchases							$ 2,100,000
TGS Proceeds from Securitization Bonds				$ 197,000
Amortization of Rate Deferral	14,700	9,400	$ 5,500
ONGProceedsFromSecuritizationBonds		1,300,000
ODFASecuritizationBondIssuance						$ 1,400,000
5.486% KGSS-I Securitized Utility Tariff Bonds Due 2032
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Debt Instrument, Face Amount					$ 336,000
Debt Instrument, Interest Rate, Stated Percentage					5.486%
West Texas Service Area
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
TGS Deferred Extraordinary Costs from 2021 Winter Storm Uri	26,600
Pension and postretirement benefit costs [Member]
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Liability, Current		(8,228)
Regulatory Liability, Noncurrent		0
Regulatory Liabilities		(8,228)
Income tax rate changes [Member] [Domain]
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Liability, Current	0	0
Regulatory Liability, Noncurrent	(500,478)	(529,441)
Regulatory Liabilities	(500,478)	(529,441)
Over-recovered purchased-gas costs [Member]
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Liability, Current	(66,901)	(39,639)
Regulatory Liability, Noncurrent	0	0
Regulatory Liabilities	(66,901)	(39,639)
Winter weather event costs
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Assets, Current	22,633	221,926
Regulatory Assets, Noncurrent	21,495	36,291
Regulatory Assets	44,128	258,217
Under-recovered purchased-gas costs [Member]
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Assets, Current	10,391	19,755
Regulatory Assets, Noncurrent	0	0
Regulatory Assets	10,391	19,755
Pension and postretirement benefit costs [Member]
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Assets, Current	6,379	0
Regulatory Assets, Noncurrent	228,092	258,257
Regulatory Assets	234,471	258,257
Reacquired debt costs [Member]
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Assets, Current	723	812
Regulatory Assets, Noncurrent	2,712	3,347
Regulatory Assets	3,435	4,159
MGP Costs [Member] [Member]
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Assets, Current	98	98
Regulatory Assets, Noncurrent	31,893	29,743
Regulatory Assets	31,991	29,841
Ad valorem tax [Member]
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Assets, Current	14,533	13,359
Regulatory Assets, Noncurrent	0	0
Regulatory Assets	14,533	13,359
Weather normalization [Member]
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Assets, Current	11,404	8,474
Regulatory Assets, Noncurrent	0	0
Regulatory Assets	11,404	8,474
Customer credit deferrals
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Assets, Current	6,184	9,504
Regulatory Assets, Noncurrent	0	0
Regulatory Assets	6,184	9,504
Other regulatory assets [Member]
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Assets, Current	2,963	1,644
Regulatory Assets, Noncurrent	3,714	3,193
Regulatory Assets	$ 6,677	$ 4,837