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Derivative Instruments Notional Amounts - Northwest Natural Gas Company [Member]
therm in Thousands, $ in Thousands
Jun. 30, 2023
USD ($)
therm
Dec. 31, 2022
USD ($)
therm
Jun. 30, 2022
USD ($)
therm
Gas Year 2021-2022 | Oregon [Member]      
Derivative [Line Items]      
TargetHedgeAchieved 84.00%    
Financial [Member] | Gas Year 2021-2022 | Oregon [Member]      
Derivative [Line Items]      
TargetHedgeAchieved 67.00%    
Physical [Member] | Gas Year 2021-2022 | Oregon [Member]      
Derivative [Line Items]      
TargetHedgeAchieved 17.00%    
Natural Gas Therms [Member] | Financial [Member]      
Derivative [Line Items]      
Derivative, Nonmonetary Notional Amount 801,020 852,435 718,965
Natural Gas Therms [Member] | Physical [Member]      
Derivative [Line Items]      
Derivative, Nonmonetary Notional Amount 538,794 463,254 516,590
Foreign Exchange Contract [Member]      
Derivative [Line Items]      
Derivative, Notional Amount | $ $ 10,438 $ 7,617 $ 7,659