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Commitments, Contingencies and Guarantees (Tables) | 12 Months Ended
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Dec. 31, 2017
COMMITMENTS, CONTINGENCIES AND GUARANTEES |
Schedule of commitments |
|  | Payment due by period |
($ millions) |  | 2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 and beyond |  | Total |
Commitments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Product transportation and storage |  | 1 108 |  | 976 |  | 983 |  | 993 |  | 905 |  | 9 603 |  | 14 568 |
| Energy services |  | 199 |  | 160 |  | 204 |  | 141 |  | 143 |  | 353 |  | 1 200 |
| Exploration work commitments |  | — |  | 115 |  | 138 |  | 157 |  | 87 |  | — |  | 497 |
| Other |  | 356 |  | 191 |  | 190 |  | 143 |  | 83 |  | 406 |  | 1 369 |
Operating leases |  | 439 |  | 330 |  | 291 |  | 252 |  | 208 |  | 687 |  | 2 207 |
|  | 2 102 |  | 1 772 |  | 1 806 |  | 1 686 |  | 1 426 |  | 11 049 |  | 19 841 |

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