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Debt - Narrative (Details)
1 Months Ended 3 Months Ended
Apr. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
Mar. 22, 2024
Dec. 31, 2023
USD ($)
Apr. 30, 2023
USD ($)
Debt Instrument [Line Items]          
Short-term debt   $ 644,000,000   $ 628,500,000  
SWH term loan facility | Secured Debt          
Debt Instrument [Line Items]          
Debt instrument face amount         $ 550,000,000
Centuri | Subsequent Event          
Debt Instrument [Line Items]          
Repayments of debt $ 316,000,000        
Centuri | Centuri Secured Term Loan Facility And Revolving Credit Facility          
Debt Instrument [Line Items]          
Credit facility maximum borrowing capacity   1,545,000,000      
Borrowings outstanding under facility   1,100,000,000      
Centuri | Centuri secured term loan facility          
Debt Instrument [Line Items]          
Credit facility maximum borrowing capacity   1,145,000,000      
Centuri | Centuri secured term loan facility | Subsequent Event          
Debt Instrument [Line Items]          
Repayments of debt 160,000,000        
$400 Million Credit Facility | Southwest Gas Corporation          
Debt Instrument [Line Items]          
Credit facility maximum borrowing capacity   400,000,000      
Line of credit designated as long term debt   150,000,000      
Line of credit designated for working capital purposes   250,000,000      
Long-term debt outstanding   0      
Short-term debt   $ 0      
$400 Million Credit Facility | Southwest Gas Corporation | Secured Overnight Financing Rate (SOFR)          
Debt Instrument [Line Items]          
Debt, basis spread on variable rate   1.125%      
$400 Million Credit Facility | Southwest Gas Corporation | Alternative base rate          
Debt Instrument [Line Items]          
Debt, basis spread on variable rate   0.125%      
Centuri secured revolving credit facility | Centuri | Subsequent Event          
Debt Instrument [Line Items]          
Repayments of debt $ 156,000,000        
Centuri secured revolving credit facility | Centuri | Line of Credit          
Debt Instrument [Line Items]          
Credit facility maximum borrowing capacity   $ 400,000,000      
Revolving Credit Facility | Centuri | Line of Credit          
Debt Instrument [Line Items]          
Debt secured by assets   2,400,000,000      
Revolving Credit Facility | Centuri | Line of Credit | Fiscal quarter ending March 31, 2024          
Debt Instrument [Line Items]          
Debt covenant, net leverage ratio     5.75    
Revolving Credit Facility | Centuri | Line of Credit | Fiscal quarter ending June 30, 2024          
Debt Instrument [Line Items]          
Debt covenant, net leverage ratio     6.00    
Revolving Credit Facility | Centuri | Line of Credit | Fiscal quarter ending September 30, 2024          
Debt Instrument [Line Items]          
Debt covenant, net leverage ratio     5.75    
$300 Million Credit Facility          
Debt Instrument [Line Items]          
Line of credit facility, maximum commitment amount   300,000,000      
Short-term debt   $ 94,000,000