REGULATORY ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Aug. 25, 2022	Dec. 31, 2021	Feb. 28, 2021
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Assets, Current	$ 316,131			$ 1,611,676
Regulatory Assets, Noncurrent	624,484			724,862
Regulatory Assets	940,615			2,336,538
Regulatory Liability, Current	(38,171)			(8,090)
Regulatory Liability, Noncurrent	(536,612)			(552,928)
Regulatory Liabilities	(574,783)			(561,018)
Net regulatory assets (liabilities), current	277,960			1,603,586
Net regulatory assets (liabilities), noncurrent	87,872			171,934
Net Regulatory Assets	365,832			1,775,520
February 2021 Natural Gas Purchases					$ 2,100,000
ONG Deferred Extraordinary Costs from 2021 Winter Storm Uri	1,300,000
Maximum amount the regulatory asset for the winter storm can be reduced by for collections of penalties assessed on marketers and individually balanced transportation customers	52,600
Collections of penalties assessed on marketers and individually balanced transportation customers as a result of Winter Storm Uri	49,400
KGS Winter Weather Securitized Utility Tariff Bond	328,000
KGS Deferred Extraordinary Costs from 2021 Winter Storm Uri	339,600
TGS Deferred Extraordinary Costs from 2021 Winter Storm Uri	246,700
Deferred Extraordinary Costs from 2021 Winter Storm Uri	586,200
Amortization of Rate Deferral	6,900	$ 4,400
ONG Proceeds from Securitization Bonds	1,300,000
ONG Securitization Bond Issuance			$ 1,350,000
West Texas Service Area
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
TGS Deferred Extraordinary Costs from 2021 Winter Storm Uri	47,800
Income tax rate changes [Member] [Domain]
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Liability, Current	0			0
Regulatory Liability, Noncurrent	(536,612)			(552,928)
Regulatory Liabilities	(536,612)			(552,928)
Over-recovered purchased-gas costs [Member]
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Liability, Current	(38,171)			(8,090)
Regulatory Liability, Noncurrent	0			0
Regulatory Liabilities	(38,171)			(8,090)
Winter weather event costs
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Assets, Current	243,232			1,536,054
Regulatory Assets, Noncurrent	342,997			428,023
Regulatory Assets	586,229			1,964,077
Under-recovered purchased-gas costs [Member]
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Assets, Current	28,193			31,863
Regulatory Assets, Noncurrent	0			0
Regulatory Assets	28,193			31,863
Pension and postretirement benefit costs [Member]
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Assets, Current	4,010			11,507
Regulatory Assets, Noncurrent	245,637			260,559
Regulatory Assets	249,647			272,066
Reacquired debt costs [Member]
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Assets, Current	811			812
Regulatory Assets, Noncurrent	3,528			4,070
Regulatory Assets	4,339			4,882
MGP Costs [Member] [Member]
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Assets, Current	98			98
Regulatory Assets, Noncurrent	29,767			29,841
Regulatory Assets	29,865			29,939
Ad valorem tax [Member]
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Assets, Current	12,779			8,561
Regulatory Assets, Noncurrent	0			0
Regulatory Assets	12,779			8,561
Weather normalization [Member]
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Assets, Current	10,555			10,044
Regulatory Assets, Noncurrent	0			0
Regulatory Assets	10,555			10,044
Customer credit deferrals
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Assets, Current	14,595			10,685
Regulatory Assets, Noncurrent	0			0
Regulatory Assets	14,595			10,685
Other regulatory assets [Member]
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Assets, Current	1,858			2,052
Regulatory Assets, Noncurrent	2,555			2,369
Regulatory Assets	$ 4,413			$ 4,421