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Expenses by Nature | 12 Months Ended
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Dec. 31, 2018
Analysis of income and expense [abstract] |
Expenses by Nature | Expenses by Nature Expenses classified by nature are as follows:
Year ended Dec. 31 | 2018 | 2017 | 2016
| Fuel and purchased power |  | Operations, maintenance and administration |  | Fuel and purchased power |  | Operations, maintenance and administration |  | Fuel and purchased power |  | Operations, maintenance and administration |
Fuel(1) | 656 |  | — |  | 685 |  | — |  | 665 |  | — |
Coal inventory writedown (recovery) | — |  | — |  | — |  | — |  | (4 | ) | — |
Purchased power | 210 |  | — |  | 162 |  | — |  | 143 |  | — |
Mine depreciation | 136 |  | — |  | 73 |  | — |  | 63 |  | — |
Salaries and benefits(1) | 98 |  | 245 |  | 96 |  | 248 |  | 96 |  | 249 |
Other operating expenses | — |  | 270 |  | — |  | 269 |  | — |  | 240 |
Total | 1,100 |  | 515 |  | 1,016 |  | 517 |  | 963 |  | 489 |
(1) $90 million in both 2017 and 2016 was reclassified from fuel to salaries and benefits to be consistent with the 2018 classification.

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- Definition The disclosure of expenses by nature. [Refer: Expenses, by nature] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_10_e&doctype=Standard -URIDate 2017-03-09 + Details
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