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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2019
Disclosure of detailed information about goodwill [Abstract] |
Disclosure of detailed information about goodwill | A reconciliation of the changes in the carrying amount of intangible assets is as follows:
| Coal rights | Software and other | Power sale contracts | Intangibles under development | Total
Cost |  |  |  |  |
As at Dec. 31, 2017 | 178 |  | 314 |  | 223 |  | 29 |  | 744 |
Additions(1) | — |  | — |  | — |  | 53 |  | 53 |
Retirements and disposals(2) | — |  | (2) |  | — |  | — |  | (2) |
Change in foreign exchange rates | — |  | 3 |  | — |  | — |  | 3 |
Transfers | 7 |  | 24 |  | 14 |  | (36) |  | 9 |
As at Dec. 31, 2018 | 185 |  | 339 |  | 237 |  | 46 |  | 807 |
Assets transferred to right of use assets on implementation of IFRS 16 (Note 3 and 18) | — |  | (5) |  | — |  | — |  | (5) |
Additions | — |  | — |  | — |  | 14 |  | 14 |
Acquisition | — |  | 1 |  | — |  | 15 |  | 16 |
Disposals (Note 4(D)) | (37) |  | (1) |  | — |  | — |  | (38) |
Change in foreign exchange rates | — |  | (4) |  | (1) |  | (1) |  | (6) |
Transfers | 1 |  | 48 |  | 14 |  | (63) |  | — |
As at Dec. 31, 2019 | 149 |  | 378 |  | 250 |  | 11 |  | 788 |
Accumulated amortization |  |  |  |  |
As at Dec. 31, 2017 | 125 |  | 188 |  | 67 |  | — |  | 380 |
Amortization | 9 |  | 32 |  | 9 |  | — |  | 50 |
Retirements and disposals | — |  | (1) |  | — |  | — |  | (1) |
Change in foreign exchange rates | — |  | 2 |  | — |  | — |  | 2 |
Transfers | (17) |  | — |  | 20 |  | — |  | 3 |
As at Dec. 31, 2018 | 117 |  | 221 |  | 96 |  | — |  | 434 |
Assets transferred to right of use assets on implementation of IFRS 16 (Note 3 and 18) | — |  | (3) |  | — |  | — |  | (3) |
Amortization | 8 |  | 31 |  | 11 |  | — |  | 50 |
Disposals (Note 4(D)) | (9) |  | (1) |  | — |  | — |  | (10) |
Change in foreign exchange rates | — |  | (1) |  | — |  | — |  | (1) |
Transfers | 1 |  | (1) |  | — |  | — |  | — |
As at Dec. 31, 2019 | 117 |  | 246 |  | 107 |  | — |  | 470 |
Carrying amount |  |  |  |  |
As at Dec. 31, 2017 | 53 |  | 126 |  | 156 |  | 29 |  | 364 |
As at Dec. 31, 2018 | 68 |  | 118 |  | 141 |  | 46 |  | 373 |
As at Dec. 31, 2019 | 32 |  | 132 |  | 143 |  | 11 |  | 318 |
Goodwill acquired through business combinations has been allocated to CGUs that are expected to benefit from the synergies of the acquisitions. Goodwill by segments are as follows:
As at Dec. 31 | 2019 | 2018
Hydro | 258 |  | 259 |
Wind and Solar | 176 |  | 175 |
Energy Marketing | 30 |  | 30 |
Total goodwill | 464 |  | 464 |

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- Definition The disclosure of the reconciliation of changes in intangible assets and goodwill. [Refer: Intangible assets and goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2018-01-01 -Paragraph 118 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Disclosure of detailed information about goodwill [Abstract] + References No definition available. + Details
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