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Revenue (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 CAD ($)
Canadian Coal |
Disclosure of disaggregation of revenue from contracts with customers [line items] |
Transaction price allocated to remaining performance obligations | $ 452
Canadian Gas |
Disclosure of disaggregation of revenue from contracts with customers [line items] |
Transaction price allocated to remaining performance obligations | 18
Australian Gas |
Disclosure of disaggregation of revenue from contracts with customers [line items] |
Transaction price allocated to remaining performance obligations | 2,095
Wind and Solar |
Disclosure of disaggregation of revenue from contracts with customers [line items] |
Transaction price allocated to remaining performance obligations | 8
Hydro |
Disclosure of disaggregation of revenue from contracts with customers [line items] |
Transaction price allocated to remaining performance obligations | 72
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 | 116
2023 | Australian Gas |
Disclosure of disaggregation of revenue from contracts with customers [line items] |
Revenue from performance obligations satisfied or partially satisfied in previous periods | 223
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
Minimum | 2024 | Canadian Coal |
Disclosure of disaggregation of revenue from contracts with customers [line items] |
Revenue from performance obligations satisfied or partially satisfied in previous periods | 5
Minimum | More than five years | Canadian Coal |
Disclosure of disaggregation of revenue from contracts with customers [line items] |
Revenue from performance obligations satisfied or partially satisfied in previous periods | 40
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
Maximum | 2024 | 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 | More than five years | Canadian Coal |
Disclosure of disaggregation of revenue from contracts with customers [line items] |
Revenue from performance obligations satisfied or partially satisfied in previous periods | $ 45

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