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Provisions (Tables) | 12 Months Ended
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Dec. 31, 2017
Provisions |
Provisions disclosure |
($ millions) |  | Decommissioning and Restoration(1) |  | Royalties |  | Other(2) |  | Total |  |
At December 31, 2015 |  | 5 505 |  | 323 |  | 280 |  | 6 108 |  |
Liabilities incurred |  | 279 |  | 93 |  | 53 |  | 425 |  |
Change in discount rate |  | 532 |  | — |  | — |  | 532 |  |
Changes in estimates |  | (824 | ) | (79 | ) | 11 |  | (892 | ) |
Liabilities settled |  | (269 | ) | (30 | ) | (68 | ) | (367 | ) |
Accretion |  | 269 |  | — |  | — |  | 269 |  |
Asset acquisitions |  | 1 356 |  | — |  | — |  | 1 356 |  |
Foreign exchange |  | (98 | ) | — |  | (1 | ) | (99 | ) |
Reclassified to assets held for sale (notes 36 and 37) |  | (4 | ) | — |  | (5 | ) | (9 | ) |
At December 31, 2016 |  | 6 746 |  | 307 |  | 270 |  | 7 323 |  |
Less: current portion |  | (403 | ) | (307 | ) | (71 | ) | (781 | ) |
|  | 6 343 |  | — |  | 199 |  | 6 542 |  |
At December 31, 2016 |  | 6 746 |  | 307 |  | 270 |  | 7 323 |  |
Liabilities incurred |  | 494 |  | 29 |  | 34 |  | 557 |  |
Change in discount rate |  | 255 |  | — |  | — |  | 255 |  |
Changes in estimates |  | 92 |  | (89 | ) | (6 | ) | (3 | ) |
Liabilities settled |  | (353 | ) | (7 | ) | (42 | ) | (402 | ) |
Accretion |  | 247 |  | — |  | — |  | 247 |  |
Asset acquisitions |  | 5 |  | — |  | — |  | 5 |  |
Foreign exchange |  | (21 | ) | — |  | (2 | ) | (23 | ) |
At December 31, 2017 |  | 7 465 |  | 240 |  | 254 |  | 7 959 |  |
Less: current portion |  | (434 | ) | (240 | ) | (48 | ) | (722 | ) |
|  | 7 031 |  | — |  | 206 |  | 7 237 |  |
(1) | Represents decommissioning and restoration provisions associated with the retirement of Property, Plant and Equipment and Exploration and Evaluation assets. The total undiscounted amount of estimated future cash flows required to settle the obligations at December 31, 2017 was approximately $12.2 billion (December 31, 2016 – $11.7 billion). A weighted average credit-adjusted risk-free interest rate of 3.70% was used to discount the provision recognized at December 31, 2017 (December 31, 2016 – 3.90%). The credit-adjusted risk-free interest rate used reflects the expected time frame of the provisions. Payments to settle the decommissioning and restoration provisions occur on an ongoing basis and will continue over the lives of the operating assets, which can exceed 50 years.
(2) | Includes legal, environmental and lease inducement provisions.
Impact of changes in discount rate on decommissioning and restoration liabilities. |
As at December 31 |  | 2017 |  | 2016 |  |
1% Increase |  | (1 218 | ) | (1 036 | ) |
1% Decrease |  | 1 758 |  | 1 506 |  |

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