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Long term debt (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 10, 2020
Apr. 27, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]          
Proceeds from Issuance of Long-term Debt $ 230 $ 200 $ 549 $ 470 $ 75
Line of Credit Facility, Interest Rate During Period       1.37%  
Pollution Control Revenue Bonds owned by PGE     0 $ 21  
Long-term Debt, Current Maturities     160 0  
Repayments of Long-term Debt     $ (98) $ (350) $ (24)
Debt Instrument, Redemption, Period One [Member]          
Debt Instrument [Line Items]          
Proceeds from Issuance of Long-term Debt 70        
Debt Instrument, Redemption, Period Two [Member]          
Debt Instrument [Line Items]          
Proceeds from Issuance of Long-term Debt $ 160