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Expenses by Nature (Tables) | 12 Months Ended
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Dec. 31, 2022
Analysis of income and expense [abstract] |
Disclosure of expenses classified by nature | Fuel and purchased power and OM&A expenses classified by nature are as follows:
Year ended Dec. 31 | 2022 |  | 2021 |  | 2020
| Fuel and purchased power | OM&A |  | Fuel and purchased power | OM&A |  | Fuel and purchased power | OM&A
Gas fuel costs | 578 |  | — |  |  | 306 |  | — |  |  | 159 |  | — |
Coal fuel costs(1) | 141 |  | — |  |  | 164 |  | — |  |  | 269 |  | — |
Royalty, land lease, other direct costs | 25 |  | — |  |  | 19 |  | — |  |  | 20 |  | — |
Purchased power | 514 |  | — |  |  | 339 |  | — |  |  | 163 |  | — |
Mine depreciation(2) | — |  | — |  |  | 190 |  | — |  |  | 144 |  | — |
Salaries and benefits | 5 |  | 263 |  |  | 36 |  | 234 |  |  | 50 |  | 235 |
Other operating expenses(3) | — |  | 258 |  |  | — |  | 277 |  |  | — |  | 237 |
Total | 1,263 |  | 521 |  |  | 1,054 |  | 511 |  |  | 805 |  | 472 |
(1) Included in coal fuel costs for 2021 and 2020 was $17 million and $15 million, respectively, related to the impairment of coal inventory. (2) Included in mine depreciation for 2021 and 2020 was $48 million and $22 million, respectively, 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 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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