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STOCK-BASED COMPENSATION - Narrative (Details) shares in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Intrinsic value of options exercised | $ 0 | $ 0 |
Unrecognized compensation cost | 12,931.344000000 | 0 |
Global Employee Share Plan (GESP) |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Expense (recovery) from share-based payment transactions with employees | 9,000,000 |  |
RSUs |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Expense (recovery) from share-based payment transactions with employees | $ 42,000,000 | $ 60,000,000 |
Vesting period | 3 years |  |
Weighted average remaining contractual life | 1 year 69 days | 1 year 33 days |
Number of units outstanding (shares) | shares | 4,537,000 | 6,452,000 | 6,627,000
Fair value of shares outstanding | $ 37,700,000 | $ 58,600,000 | $ 24,600,000
RSUs | Acacia Mining PLC |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Fair value of shares outstanding | $ 2,000,000 | $ 3,000,000 |
RSUs | Minimum |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting period | 2 years 6 months |  |
RSUs | Maximum |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting period | 3 years |  |
DSUs |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Maximum election amount of required annual retainer | 100.00% |  |
Number of units outstanding (shares) | shares | 725,000 | 573,000 | 465,000
Fair value of shares outstanding | $ 11,600,000 | $ 9,200,000 | $ 3,500,000
DSUs | Acacia Mining PLC |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Fair value of shares outstanding | $ 0 | $ 1,000,000 |
PRSUs |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting period | 3 years |  |
Number of units outstanding (shares) | shares | 0 | 489 |
Fair value of shares outstanding |  | $ 6,000,000 |
PRSUs | Acacia Mining PLC |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Fair value of shares outstanding | $ 0 | $ 8,000,000 |
PGSUs |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of units outstanding (shares) | shares | 2,174 | 1,536 |
Fair value of shares outstanding | $ 14,000,000 | $ 11,000,000 |
ESPP |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Expense (recovery) from share-based payment transactions with employees | $ 400,000 | 300,000 |
Vesting period | 1 year |  |
Stock options |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Expense (recovery) from share-based payment transactions with employees | $ 0 | $ 0 |
Vesting period | 4 years |  |
Exercise period | 7 years |  |
Number of shares available for grant (shares) | shares | 1,000 | 2,100 |
Recognition period | 1 year | 1 year |

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