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Other Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of financial assets [abstract] |
Disclosure of components in other non current assets | The components of other assets are as follows:
As at Dec. 31 | 2017 |  | 2016 |
South Hedland prepaid transmission access and distribution | 75 |  | — |
Deferred licence fees | 13 |  | 15 |
Project development costs | 53 |  | 46 |
Deferred service costs | 15 |  | 16 |
Mississauga long-term receivable (Note 4) | — |  | 116 |
Long-term prepaids and other assets | 44 |  | 44 |
Loan receivable | 33 |  | — |
Keephills Unit 3 transmission deposit | 4 |  | 5 |
Total other assets | 237 |  | 242 |
Additions to non-current assets are as follows:
Year ended Dec. 31, 2017 | Canadian Coal |  | US Coal |  | Canadian Gas |  | Australian Gas |  | Wind and Solar |  | Hydro |  | Energy Marketing |  | Corporate |  | Total |
Additions to non-current assets: |  |  |  |  |  |  |  |  |
PP&E | 116 |  | 35 |  | 31 |  | 114 |  | 20 |  | 16 |  | — |  | 6 |  | 338 |
Intangible assets | 5 |  | 1 |  | — |  | 29 |  | — |  | — |  | — |  | 16 |  | 51 |
Year ended Dec. 31, 2016 | Canadian Coal |  | US Coal |  | Canadian Gas |  | Australian Gas |  | Wind and Solar |  | Hydro |  | Energy Marketing |  | Corporate |  | Total |
Additions to non-current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PP&E | 159 |  | 15 |  | 11 |  | 107 |  | 16 |  | 43 |  | — |  | 7 |  | 358 |
Intangibles | 3 |  | 1 |  | 1 |  | — |  | — |  | — |  | — |  | 16 |  | 21 |
Year ended Dec. 31, 2015 | Canadian Coal |  | US Coal |  | Canadian Gas |  | Australian Gas |  | Wind and Solar |  | Hydro |  | Energy Marketing |  | Corporate |  | Total |
Additions to non-current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PP&E | 179 |  | 13 |  | 19 |  | 204 |  | 13 |  | 43 |  | 1 |  | 4 |  | 476 |
Intangibles | 6 |  | — |  | — |  | — |  | — |  | — |  | 3 |  | 17 |  | 26 |

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