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Commitments (Tables) | 12 Months Ended
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Dec. 31, 2017
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Detailed Information about Contractual Obligations and Commitments | Cemig and its subsidiaries have contractual obligations and commitments that include, principally, amortization of loans and financings, contracts with contractors for construction of new projects, and purchase of energy from Itaipu and other sources, as follows:
|  | 2018 |  |  | 2019 |  |  | 2020 |  |  | 2021 |  |  | 2022 |  |  | After 2022 |  |  | Total |
Purchase of energy from Itaipu |  |  | 1,278 |  |  |  | 1,332 |  |  |  | 1,367 |  |  |  | 1,339 |  |  |  | 1,326 |  |  |  | 1,298 |  |  |  | 7,940 |
Purchase of energy – auctions |  |  | 2,837 |  |  |  | 2,815 |  |  |  | 3,178 |  |  |  | 3,724 |  |  |  | 3,898 |  |  |  | 4,040 |  |  |  | 20,492 |
Purchase of energy – ‘bilateral contracts’ |  |  | 296 |  |  |  | 307 |  |  |  | 323 |  |  |  | 338 |  |  |  | 356 |  |  |  | 375 |  |  |  | 1,995 |
Quotas for Angra 1 and Angra 2 |  |  | 264 |  |  |  | 272 |  |  |  | 291 |  |  |  | 297 |  |  |  | 311 |  |  |  | 325 |  |  |  | 1,760 |
Transport of energy from Itaipu |  |  | 227 |  |  |  | 232 |  |  |  | 236 |  |  |  | 220 |  |  |  | 206 |  |  |  | 216 |  |  |  | 1,337 |
Other energy purchase contracts |  |  | 3,497 |  |  |  | 2,735 |  |  |  | 2,758 |  |  |  | 2,994 |  |  |  | 3,030 |  |  |  | 2,647 |  |  |  | 17,661 |
Purchase of gas for resale |  |  | 546 |  |  |  | 559 |  |  |  | 586 |  |  |  | 611 |  |  |  | 640 |  |  |  | 669 |  |  |  | 3,611 |
Operating leasing transactions |  |  | 98 |  |  |  | 76 |  |  |  | 61 |  |  |  | 64 |  |  |  | 68 |  |  |  | 72 |  |  |  | 439 |
Total |  |  | 9,043 |  |  |  | 8,328 |  |  |  | 8,800 |  |  |  | 9,587 |  |  |  | 9,835 |  |  |  | 9,642 |  |  |  | 55,235 |

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