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Expenses by Nature | 12 Months Ended
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Dec. 31, 2023
Analysis of income and expense [abstract] |
Expenses by Nature | Expenses by Nature Fuel, Purchased Power and Operations, Maintenance and Administration ("OM&A") Fuel and purchased power and OM&A expenses classified by nature are as follows:
Year ended Dec. 31 |  |  | 2023 | 2022 | 2021
|  |  |  | Fuel and purchased power | OM&A | Fuel and purchased power | OM&A | Fuel and purchased power | OM&A
Gas fuel costs |  |  |  |  | 384 |  | — |  | 578 |  | — |  | 306 |  | — |
Coal fuel costs(1) |  |  |  |  | 177 |  | — |  | 146 |  | — |  | 164 |  | — |
Royalty, land lease, other direct costs |  |  |  |  | 25 |  | — |  | 25 |  | — |  | 19 |  | — |
Purchased power |  |  |  |  | 474 |  | — |  | 514 |  | — |  | 339 |  | — |
Mine depreciation(2) |  |  |  |  | — |  | — |  | — |  | — |  | 190 |  | — |
Salaries and benefits |  |  |  |  | — |  | 254 |  | — |  | 263 |  | 36 |  | 234 |
Other operating expenses(3) |  |  |  |  | — |  | 285 |  | — |  | 258 |  | — |  | 277 |
Total |  |  |  |  | 1,060 |  | 539 |  | 1,263 |  | 521 |  | 1,054 |  | 511 |
(1)Included in coal fuel costs for 2021 was $17 million related to the impairment of coal inventory. (2)Included in mine depreciation for 2021 was $48 million related to mine depreciation that was initially recorded in the standard cost of coal inventory and then subsequently written down during 2021. (3)Included in OM&A costs for 2023 was $14 million related to the write-down of parts and material inventory related to our natural-gas-fired facilities. Included in OM&A costs for 2021 was $28 million related to the write-down of parts and material inventory related to the Highvale mine and coal operations at our natural gas converted facilities.

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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 2023-01-01 -Paragraph 10 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_10_e&doctype=Standard -URIDate 2023-03-23 + Details
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