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Regulatory Matters - EGTS (Details) - EGTS - USD ($)
$ in Millions
1 Months Ended 11 Months Ended
Sep. 30, 2021
Feb. 28, 2023
Schedule Of Regulatory Assets and Liabilities [Line Items]    
Provision for rate refunds   $ 91
General Rate Case | Federal Energy Regulatory Commission    
Schedule Of Regulatory Assets and Liabilities [Line Items]    
Proposed annual cost-of-service $ 1,100  
General Rate Case | Federal Energy Regulatory Commission | Gas Storage    
Schedule Of Regulatory Assets and Liabilities [Line Items]    
Proposed annual cost-of-service, rate increase 85.00%  
General Rate Case | Federal Energy Regulatory Commission | Gas Transportation    
Schedule Of Regulatory Assets and Liabilities [Line Items]    
Proposed annual cost-of-service, rate increase 60.00%  
General Rate Case, Depreciation Expense | Federal Energy Regulatory Commission    
Schedule Of Regulatory Assets and Liabilities [Line Items]    
Approved rate increase (decrease) amount   (30)
General Rate Case, Transportation and Storage Revenues | Federal Energy Regulatory Commission    
Schedule Of Regulatory Assets and Liabilities [Line Items]    
Approved rate increase (decrease) amount   $ 160