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POST-EMPLOYMENT BENEFITS - Allocation of Plan Assets (Details) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Disclosure of fair value of plan assets [line items] |  |
Debt securities | 39.30% | 38.50%
Other - cash | 0.80% | 0.30%
Total | 100.00% | 100.00%
Domestic |  |
Disclosure of fair value of plan assets [line items] |  |
Equity securities | 11.80% | 12.40%
International |  |
Disclosure of fair value of plan assets [line items] |  |
Equity securities | 48.10% | 48.80%
Minimum |  |
Disclosure of fair value of plan assets [line items] |  |
Target asset allocation percentage, Debt securities | 30.00% |
Target asset allocation percentage, Other - cash | 0.00% |
Minimum | Domestic |  |
Disclosure of fair value of plan assets [line items] |  |
Target asset allocation percentage, Equity securities | 7.00% |
Minimum | International |  |
Disclosure of fair value of plan assets [line items] |  |
Target asset allocation percentage, Equity securities | 33.00% |
Maximum |  |
Disclosure of fair value of plan assets [line items] |  |
Target asset allocation percentage, Debt securities |  | 50.00%
Target asset allocation percentage, Other - cash |  | 2.00%
Maximum | Domestic |  |
Disclosure of fair value of plan assets [line items] |  |
Target asset allocation percentage, Equity securities |  | 17.00%
Maximum | International |  |
Disclosure of fair value of plan assets [line items] |  |
Target asset allocation percentage, Equity securities |  | 63.00%

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