v3.26.1
Risk Management and Derivatives: Utilities (Details)
$ in Millions
Jun. 30, 2026
USD ($)
MMBTU
Dec. 31, 2025
MMBTU
Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherAssetsCurrent    
Derivative [Line Items]    
Credit Risk Derivative Liabilities, at Fair Value | $ $ 0.1  
Natural Gas, Distribution | Cash Flow Hedging    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 1,401,000  
Natural Gas, Distribution | Natural gas futures purchased    
Derivative [Line Items]    
Derivative, Remaining Maturity [1]   3 months
Natural Gas, Distribution | Natural gas futures purchased | Long    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount   620,000
Natural Gas, Distribution | Natural gas options purchased, net    
Derivative [Line Items]    
Derivative, Remaining Maturity [1] 9 months 3 months
Natural Gas, Distribution | Natural gas options purchased, net | Long    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 1,140,000 2,750,000
Natural Gas, Distribution | Natural gas basis swaps purchased    
Derivative [Line Items]    
Derivative, Remaining Maturity [1]   3 months
Natural Gas, Distribution | Natural gas basis swaps purchased | Long    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount   1,040,000
Natural Gas, Distribution | Natural gas over-the-counter swaps, net    
Derivative [Line Items]    
Derivative, Remaining Maturity [1],[2] 26 years 23 years
Natural Gas, Distribution | Natural gas over-the-counter swaps, net | Long    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount [2] 6,380,000 3,430,000
Natural Gas, Distribution | Natural gas physical contracts, net    
Derivative [Line Items]    
Derivative, Remaining Maturity [1],[3] 9 years 10 years
Natural Gas, Distribution | Natural gas physical contracts, net | Long    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount [3] 4,043,753 14,285,200
[1] Term reflects the maximum forward period hedged.
[2] As of June 30, 2026, 1,401,000 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.