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FINANCIAL RISK MANAGEMENT - Significant customer (Details) - Foreign exchange risk ¥ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 JPY (¥) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 JPY (¥) | Dec. 31, 2017 USD ($)
FINANCIAL RISK MANAGEMENT |  |  |  |
Foreign currency liabilities offset by time deposits and receivables (as a percent) | 25.00% |  |  |
USD |  |  |  |
FINANCIAL RISK MANAGEMENT |  |  |  |
Net exposure | $ |  | $ 82 |  | $ (43)
Yen |  |  |  |
FINANCIAL RISK MANAGEMENT |  |  |  |
Net exposure | ¥ | ¥ (4,648) |  | ¥ (5,406) |
Minimum |  |  |  |
FINANCIAL RISK MANAGEMENT |  |  |  |
Duration of time deposits and hedging instruments | 3 months |  |  |
Maximum |  |  |  |
FINANCIAL RISK MANAGEMENT |  |  |  |
Duration of time deposits and hedging instruments | 12 months |  |  |
Financial asset | USD |  |  |  |
FINANCIAL RISK MANAGEMENT |  |  |  |
Net exposure | $ |  | 473 |  | 261
Financial asset | Yen |  |  |  |
FINANCIAL RISK MANAGEMENT |  |  |  |
Net exposure | ¥ | ¥ 8 |  | 7 |
Financial liability | USD |  |  |  |
FINANCIAL RISK MANAGEMENT |  |  |  |
Net exposure | $ |  | $ (391) |  | $ (304)
Financial liability | Yen |  |  |  |
FINANCIAL RISK MANAGEMENT |  |  |  |
Net exposure | ¥ | ¥ (4,656) |  | ¥ (5,413) |

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