v3.25.4
Risk Management and Derivatives: Utilities (Details)
$ in Millions
Dec. 31, 2025
USD ($)
MMBTU
Dec. 31, 2024
MMBTU
Derivative [Line Items]    
Credit Risk Derivative Liabilities, at Fair Value | $ $ 2.9  
Natural Gas, Distribution | Cash Flow Hedging    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 1,915,000  
Natural Gas, Distribution | Natural gas futures purchased    
Derivative [Line Items]    
Derivative, Remaining Maturity [1] 3 years 3 years
Natural Gas, Distribution | Natural gas futures purchased | Long    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 620,000 660,000
Natural Gas, Distribution | Natural gas options purchased, net    
Derivative [Line Items]    
Derivative, Remaining Maturity [1] 3 years 3 years
Natural Gas, Distribution | Natural gas options purchased, net | Long    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 2,750,000 2,780,000
Natural Gas, Distribution | Natural gas basis swaps purchased    
Derivative [Line Items]    
Derivative, Remaining Maturity [1] 3 years 3 years
Natural Gas, Distribution | Natural gas basis swaps purchased | Long    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 1,040,000 1,080,000
Natural Gas, Distribution | Natural gas over-the-counter swaps, net    
Derivative [Line Items]    
Derivative, Remaining Maturity [1],[2] 23 years 20 years
Natural Gas, Distribution | Natural gas over-the-counter swaps, net | Long    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount [2] 3,430,000 3,480,000
Natural Gas, Distribution | Natural gas physical commitments, net    
Derivative [Line Items]    
Derivative, Remaining Maturity [1],[3] 10 years 10 years
Natural Gas, Distribution | Natural gas physical commitments, net | Long    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount [3] 14,285,200 20,276,230
[1] Term reflects the maximum forward period hedged.
[2] As of December 31, 2025, 1,915,000 MMBtus of natural gas over-the-counter swaps purchased were designated as cash flow hedges.
[3] Volumes exclude derivative contracts that qualify for the normal purchase, normal sales exception permitted by GAAP.