ACCOUNTING POLICIES - Goodwill and Other Intangible Assets (Details)	12 Months Ended
	Dec. 31, 2018
Goodwill and Other Intangible Assets
Period of operation forecasts used in impairment test	5 years
Weighted average cost of capital (as a percent)	9.00%
Minimum
Goodwill and Other Intangible Assets
Assumed annual growth rate of cash flows (as a percent)	2.00%
Maximum
Goodwill and Other Intangible Assets
Assumed annual growth rate of cash flows (as a percent)	3.00%
Measurement Input, Discount Rate [Member] | Minimum
Goodwill and Other Intangible Assets
Goodwill, measurement input	11.00%
Measurement Input, Discount Rate [Member] | Maximum
Goodwill and Other Intangible Assets
Goodwill, measurement input	13.50%
Measurement Input, Discount Rate [Member] | Assets, Total [Member] | Minimum
Goodwill and Other Intangible Assets
Discount rate on estimated discounted cash flows (as a percent)	12.00%
Measurement Input, Discount Rate [Member] | Assets, Total [Member] | Maximum
Goodwill and Other Intangible Assets
Discount rate on estimated discounted cash flows (as a percent)	13.50%