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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of other provisions, contingent liabilities and contingent assets [Abstract] |
Disclosure of commitments and future payments | In addition to commitments disclosed elsewhere in the financial statements, the Corporation has other contractual commitments, either directly or through its interests in joint operations. Approximate future payments under these agreements are as follows:
| 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 |  | 2024 and thereafter |  | Total |
Natural gas, transportation and other purchase contracts | 28 |  | 15 |  | 13 |  | 11 |  | 12 |  | 157 |  | 236 |
Transmission | 9 |  | 10 |  | 6 |  | 4 |  | 3 |  | — |  | 32 |
Coal supply and mining agreements | 158 |  | 160 |  | 27 |  | 24 |  | 24 |  | 95 |  | 488 |
Long-term service agreements | 64 |  | 86 |  | 32 |  | 17 |  | 8 |  | 34 |  | 241 |
Non-cancellable operating leases | 8 |  | 8 |  | 8 |  | 7 |  | 4 |  | 45 |  | 80 |
Growth | 324 |  | 79 |  | 144 |  | — |  | — |  | — |  | 547 |
TransAlta Energy Transition Bill | 6 |  | 7 |  | 6 |  | 6 |  | 6 |  | — |  | 31 |
Total | 597 |  | 365 |  | 236 |  | 69 |  | 57 |  | 331 |  | 1,655 |

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