REGULATORY ASSETS AND LIABILITIES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Feb. 28, 2021
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Assets, Current	$ 1,611,676	$ 56,773
Regulatory Assets, Noncurrent	724,862	366,956
Regulatory Liability, Current	(8,090)	(15,761)
Regulatory Liability, Noncurrent	(552,928)	(547,563)
Net regulatory assets and liabilities, current	1,603,586	41,012
Net regulatory assets and liabilities, noncurrent	171,934	(180,607)
Net Regulatory Assets	1,775,520	(139,595)
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	52,400
KGS Deferred Extraordinary Costs from 2021 Winter Storm Uri	388,300
TGS Deferred Extraordinary Costs from 2021 Winter Storm Uri	256,600
Deferred Extraordinary Costs from 2021 Winter Storm Uri	2,000,000
Reduction in ADIT recorded as an EDIT regulatory liability associated with reduction of Oklahoma state income tax	29,300
Kansas Gas Service tax reform regulatory liability	84,200
Amortization of Rate Deferral	5,500	3,200	$ 2,500
North Texas Service Area [Member]
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
TGS Deferred Extraordinary Costs from 2021 Winter Storm Uri	59,500
Federal income tax rate changes [Member]
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Liability, Current	0	0
Regulatory Liability, Noncurrent	(552,928)	(547,563)
Regulatory Liabilities	$ (552,928)	$ (547,563)
Over-recovered purchased-gas costs [Member]
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Asset, Amortization Period	1 year	1 year
Regulatory Liability, Current	$ (8,090)	$ (15,761)
Regulatory Liability, Noncurrent	0	0
Regulatory Liabilities	(8,090)	(15,761)
Total regulated liabilities [Member]
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Liability, Current	(8,090)	(15,761)
Regulatory Liability, Noncurrent	(552,928)	(547,563)
Regulatory Liabilities	(561,018)	$ (563,324)
Winter weather event costs
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Assets, Current	1,536,054
Regulatory Assets, Noncurrent	428,023
Regulatory Assets	$ 1,964,077
Under-recovered purchased-gas costs [Member]
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Asset, Amortization Period	1 year	1 year
Regulatory Assets, Current	$ 31,863	$ 16,502
Regulatory Assets, Noncurrent	0	0
Regulatory Assets	31,863	16,502
Pension and postretirement benefit costs [Member]
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Assets, Current	11,507	16,541
Regulatory Assets, Noncurrent	260,559	341,266
Regulatory Assets	$ 272,066	$ 357,807
Reacquired debt costs [Member]
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Asset, Amortization Period	6 years	7 years
Regulatory Assets, Current	$ 812	$ 812
Regulatory Assets, Noncurrent	4,070	4,866
Regulatory Assets	$ 4,882	$ 5,678
MGP Costs [Member]
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Asset, Amortization Period	15 years	15 years
Regulatory Assets, Current	$ 98	$ 98
Regulatory Assets, Noncurrent	29,841	18,711
Regulatory Assets	$ 29,939	$ 18,809
Ad valorem tax [Member]
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Asset, Amortization Period	1 year	1 year
Regulatory Assets, Current	$ 8,561	$ 5,558
Regulatory Assets, Noncurrent	0	0
Regulatory Assets	$ 8,561	$ 5,558
Weather normalization [Member]
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Asset, Amortization Period	1 year	1 year
Regulatory Assets, Current	$ 10,044	$ 4,806
Regulatory Assets, Noncurrent	0	0
Regulatory Assets	$ 10,044	$ 4,806
Customer Credit Deferrals
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Asset, Amortization Period	1 year	1 year
Regulatory Assets, Current	$ 10,685	$ 10,267
Regulatory Assets, Noncurrent	0	0
Regulatory Assets	$ 10,685	$ 10,267
Other regulatory assets [Member]
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Asset, Amortization Period	1 to 18 years	1 to 18 years
Regulatory Assets, Current	$ 2,052	$ 2,189
Regulatory Assets, Noncurrent	2,369	2,113
Regulatory Assets	4,421	4,302
Total regulatory assets, net of amortization [Member]
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]
Regulatory Assets, Current	1,611,676	56,773
Regulatory Assets, Noncurrent	724,862	366,956
Regulatory Assets	$ 2,336,538	$ 423,729