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Risk Management Activities - Commodity Risk Management (Details) - Commodity risk management
kJ in Billions
Dec. 31, 2019
MWh
Dec. 31, 2019
J
Dec. 31, 2019
kJ
Dec. 31, 2019
MW
Dec. 31, 2018
MWh
Dec. 31, 2018
J
Dec. 31, 2018
kJ
Dec. 31, 2018
MW
Electricity | Cash flow hedges                
Disclosure of detailed information about hedges [line items]                
Notional amount sold 222,000       2,128,000      
Notional amount purchased 0       0      
Electricity | Non-Hedges                
Disclosure of detailed information about hedges [line items]                
Notional amount sold 16,097,000       58,885,000      
Notional amount purchased 7,204,000       37,023,000      
Natural gas | Non-Hedges                
Disclosure of detailed information about hedges [line items]                
Notional amount sold   38,062,000 80,413     80,413,000 74,194  
Notional amount purchased   55,023,000 110,488     110,488,000 103,805  
Transmission | Non-Hedges                
Disclosure of detailed information about hedges [line items]                
Notional amount sold 0       29,000      
Notional amount purchased 1,818,000       11,163,000      
Emissions | Non-Hedges                
Disclosure of detailed information about hedges [line items]                
Notional amount sold | MW       184,000       0
Notional amount purchased | MW       138,000       0