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Risk Management and Derivatives: Utilities (Details)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2023
USD ($)
MMBTU
Dec. 31, 2022
MMBTU
Derivative [Line Items]    
Credit Risk Derivative Liabilities, at Fair Value | $ $ 0.6  
Natural Gas, Distribution | Cash Flow Hedging    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 574,800  
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   630,000
Natural Gas, Distribution | Natural gas options purchased, net    
Derivative [Line Items]    
Derivative, Remaining Maturity [1]   3 months
Natural Gas, Distribution | Natural gas options purchased, net | Long    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount   1,790,000
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   900,000
Natural Gas, Distribution | Natural gas over-the-counter swaps, net    
Derivative [Line Items]    
Derivative, Remaining Maturity [1],[2] 26 months 24 months
Natural Gas, Distribution | Natural gas over-the-counter swaps, net | Long    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount [2] 3,270,000 4,460,000
Natural Gas, Distribution | Natural gas physical contracts, net    
Derivative [Line Items]    
Derivative, Remaining Maturity [1],[3] 12 months 12 months
Natural Gas, Distribution | Natural gas physical contracts, net | Long    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount [3] 3,881,190 17,864,412
[1] Term reflects the maximum forward period hedged.
[2] As of March 31, 2023, 574,800 MMBtus of natural gas over-the-counter swaps purchases were designated as cash flow hedges.
[3] Volumes exclude derivative contracts that qualify for the normal purchases and normal sales exception permitted by GAAP.