v3.25.2
Risk Management and Derivatives: Utilities (Details)
$ in Millions
Jun. 30, 2025
USD ($)
MMBTU
Dec. 31, 2024
MMBTU
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 3,040,000  
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 0 660,000
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 1,160,000 2,780,000
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 0 1,080,000
Natural Gas, Distribution | Natural gas over-the-counter swaps, net    
Derivative [Line Items]    
Derivative, Remaining Maturity [1],[2] 29 years 20 years
Natural Gas, Distribution | Natural gas over-the-counter swaps, net | Long    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount [2] 5,590,000 3,480,000
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] 6,077,280 20,276,230
[1] Term reflects the maximum forward period hedged.
[2] As of June 30, 2025, 3,040,000 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.