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Risk Management and Derivatives: Utilities (Details)
$ in Millions
Sep. 30, 2025
USD ($)
MMBTU
Dec. 31, 2024
MMBTU
Derivative [Line Items]    
Credit Risk Derivative Liabilities, at Fair Value | $ $ 0.8  
Natural Gas, Distribution | Cash Flow Hedging    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 2,805,000  
Natural Gas, Distribution | Natural gas futures purchased    
Derivative [Line Items]    
Derivative, Remaining Maturity [1] 6 months 3 months
Natural Gas, Distribution | Natural gas futures purchased | Long    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 1,760,000 660,000
Natural Gas, Distribution | Natural gas options purchased, net    
Derivative [Line Items]    
Derivative, Remaining Maturity [1] 6 months 3 months
Natural Gas, Distribution | Natural gas options purchased, net | Long    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 7,670,000 2,780,000
Natural Gas, Distribution | Natural gas basis swaps purchased    
Derivative [Line Items]    
Derivative, Remaining Maturity [1] 6 months 3 months
Natural Gas, Distribution | Natural gas basis swaps purchased | Long    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 1,760,000 1,080,000
Natural Gas, Distribution | Natural gas over-the-counter swaps, net    
Derivative [Line Items]    
Derivative, Remaining Maturity [1],[2] 26 years 20 years
Natural Gas, Distribution | Natural gas over-the-counter swaps, net | Long    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount [2] 4,810,000 3,480,000
Natural Gas, Distribution | Natural gas physical contracts, net    
Derivative [Line Items]    
Derivative, Remaining Maturity [1],[3] 6 years 10 years
Natural Gas, Distribution | Natural gas physical contracts, net | Long    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount [3] 24,513,400 20,276,230
[1] Term reflects the maximum forward period hedged.
[2] As of September 30, 2025, 2,805,000 MMBtus of natural gas over-the-counter swaps purchases were designated as cash flow hedges.
[3] Volumes exclude contracts that qualify for the normal purchases and normal sales exception under GAAP.