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REGULATORY ASSETS AND LIABILITIES (Details) - USD ($)
$ in Thousands
3 Months Ended 4 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Apr. 29, 2022
Dec. 31, 2021
Feb. 28, 2021
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]          
Regulatory Assets, Current $ 1,600,034     $ 1,611,676  
Regulatory Assets, Noncurrent 651,931     724,862  
Regulatory Assets 2,251,965     2,336,538  
Regulatory Liability, Current (32,822)     (8,090)  
Regulatory Liability, Noncurrent (542,622)     (552,928)  
Regulatory Liabilities (575,444)     (561,018)  
Net regulatory assets (liabilities), current 1,567,212     1,603,586  
Net regulatory assets (liabilities), noncurrent 109,309     171,934  
Net Regulatory Assets 1,676,521     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     $ 47,500    
KGS Deferred Extraordinary Costs from 2021 Winter Storm Uri 335,600        
TGS Deferred Extraordinary Costs from 2021 Winter Storm Uri 248,300        
Deferred Extraordinary Costs from 2021 Winter Storm Uri 1,900,000        
Amortization of Rate Deferral 4,400 $ 2,900      
North Texas Service Area          
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]          
TGS Deferred Extraordinary Costs from 2021 Winter Storm Uri 50,700        
Income tax rate changes [Member] [Domain]          
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]          
Regulatory Liability, Current 0     0  
Regulatory Liability, Noncurrent (542,622)     (552,928)  
Regulatory Liabilities (542,622)     (552,928)  
Over-recovered purchased-gas costs [Member]          
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]          
Regulatory Liability, Current (32,822)     (8,090)  
Regulatory Liability, Noncurrent 0     0  
Regulatory Liabilities (32,822)     (8,090)  
Winter weather event costs          
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]          
Regulatory Assets, Current 1,539,868     1,536,054  
Regulatory Assets, Noncurrent 366,424     428,023  
Regulatory Assets 1,906,292     1,964,077  
Under-recovered purchased-gas costs [Member]          
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]          
Regulatory Assets, Current 9,751     31,863  
Regulatory Assets, Noncurrent 0     0  
Regulatory Assets 9,751     31,863  
Pension and postretirement benefit costs [Member]          
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]          
Regulatory Assets, Current 11,508     11,507  
Regulatory Assets, Noncurrent 249,074     260,559  
Regulatory Assets 260,582     272,066  
Reacquired debt costs [Member]          
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]          
Regulatory Assets, Current 812     812  
Regulatory Assets, Noncurrent 3,889     4,070  
Regulatory Assets 4,701     4,882  
MGP Costs [Member] [Member]          
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]          
Regulatory Assets, Current 98     98  
Regulatory Assets, Noncurrent 29,816     29,841  
Regulatory Assets 29,914     29,939  
Ad valorem tax [Member]          
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]          
Regulatory Assets, Current 8,192     8,561  
Regulatory Assets, Noncurrent 0     0  
Regulatory Assets 8,192     8,561  
Weather normalization [Member]          
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]          
Regulatory Assets, Current 11,440     10,044  
Regulatory Assets, Noncurrent 0     0  
Regulatory Assets 11,440     10,044  
Customer credit deferrals          
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]          
Regulatory Assets, Current 17,177     10,685  
Regulatory Assets, Noncurrent 0     0  
Regulatory Assets 17,177     10,685  
Other regulatory assets [Member]          
SCHEDULE OF REGULATED ASSETS AND LIABILITIES [Line Items]          
Regulatory Assets, Current 1,188     2,052  
Regulatory Assets, Noncurrent 2,728     2,369  
Regulatory Assets $ 3,916     $ 4,421