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PROVISIONS | 12 Months Ended
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Dec. 31, 2017
Other provisions [abstract] |
PROVISIONS | PROVISIONS a) Provisions
| As at December 31, 2017 |  | As at December 31, 2016 |
Environmental rehabilitation ("PER") |  | $2,944 |  |  | $2,179 |
Post-retirement benefits | 48 |  | 72 |
Share-based payments | 37 |  | 34 |
Other employee benefits | 27 |  | 45 |
Other | 85 |  | 33 |
|  | $3,141 |  |  | $2,363 |
b) Environmental Rehabilitation
| 2017 |  | 2016 |
At January 1 |  | $2,246 |  |  | $1,982 |
PERs divested during the year | (31 | ) | — |
Closed Sites |  |
Impact of revisions to expected cash flows recorded in earnings | 46 |  | 146 |
Settlements |  |
Cash payments | (41 | ) | (28 | )
Settlement gains | (1 | ) | (1 | )
Accretion | 12 |  | 10 |
Operating Sites |  |
PERs arising in the year | 836 |  | 134 |
Settlements |  |
Cash payments | (18 | ) | (34 | )
Settlement gains | (1 | ) | (3 | )
Accretion | 48 |  | 40 |
At December 31 |  | $3,096 |  |  | $2,246 |
Current portion (note 24) | (152 | ) | (67 | )
|  | $2,944 |  |  | $2,179 |
The eventual settlement of substantially all PERs is expected to take place between 2018 and 2058. The PER has increased in the fourth quarter of 2017 by $864 million primarily due to changes in cost estimates at our Pascua-Lama, Lagunas Norte and Veladero properties, partially offset by changes in discount rates. For the year ended December 31, 2017, our PER balance increased by $850 million as a result of various impacts at our mine sites including new requirements related to water treatment, expanded footprints of our operations and updated estimates for reclamation activities. A 1% increase in the discount rate would result in a decrease in PER by $385 million and a 1% decrease in the discount rate would result in an increase in PER by $257 million, while holding the other assumptions constant.

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