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Revenue (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 CAD ($)
Canadian Coal |
Disclosure of disaggregation of revenue from contracts with customers [line items] |
Transaction price allocated to remaining performance obligations | $ 330
Canadian Gas |
Disclosure of disaggregation of revenue from contracts with customers [line items] |
Transaction price allocated to remaining performance obligations | 25
Australian Gas |
Disclosure of disaggregation of revenue from contracts with customers [line items] |
Transaction price allocated to remaining performance obligations | 2,280
Wind and Solar |
Disclosure of disaggregation of revenue from contracts with customers [line items] |
Transaction price allocated to remaining performance obligations | 9
Hydro |
Disclosure of disaggregation of revenue from contracts with customers [line items] |
Transaction price allocated to remaining performance obligations | 130
Later than one year | Canadian Coal |
Disclosure of disaggregation of revenue from contracts with customers [line items] |
Revenue from performance obligations satisfied or partially satisfied in previous periods | $ 245
Revenue from performance obligations satisfied or partially satisfied in previous periods, term | 2 years
Later than one year | Australian Gas |
Disclosure of disaggregation of revenue from contracts with customers [line items] |
Revenue from performance obligations satisfied or partially satisfied in previous periods | $ 230
Minimum | Canadian Coal |
Disclosure of disaggregation of revenue from contracts with customers [line items] |
Revenue from performance obligations satisfied or partially satisfied in previous periods | 7
Minimum | Canadian Gas |
Disclosure of disaggregation of revenue from contracts with customers [line items] |
Revenue from performance obligations satisfied or partially satisfied in previous periods | 4
Minimum | Australian Gas |
Disclosure of disaggregation of revenue from contracts with customers [line items] |
Revenue from performance obligations satisfied or partially satisfied in previous periods | 80
Minimum | Wind and Solar |
Disclosure of disaggregation of revenue from contracts with customers [line items] |
Revenue from performance obligations satisfied or partially satisfied in previous periods | 1
Maximum | Canadian Coal |
Disclosure of disaggregation of revenue from contracts with customers [line items] |
Revenue from performance obligations satisfied or partially satisfied in previous periods | 10
Maximum | Canadian Gas |
Disclosure of disaggregation of revenue from contracts with customers [line items] |
Revenue from performance obligations satisfied or partially satisfied in previous periods | 6
Maximum | Australian Gas |
Disclosure of disaggregation of revenue from contracts with customers [line items] |
Revenue from performance obligations satisfied or partially satisfied in previous periods | 110
Maximum | Wind and Solar |
Disclosure of disaggregation of revenue from contracts with customers [line items] |
Revenue from performance obligations satisfied or partially satisfied in previous periods | $ 2

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