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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS - ASSUMPTIONS (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Pension Benefits |  |
Benefit Obligation Assumptions: |  |
Discount rate (as a percent) | 3.45% | 3.90%
Net Periodic Benefit Cost Assumptions: |  |
Discount rate (as a percent) | 3.90% | 4.14%
Assumed long term rate of return on assets (as a percent) | 6.50% | 6.50%
Net decrease in pension plan obligations | $ (2) |
Foreign Pension Plans | Low end of range |  |
Net Periodic Benefit Cost Assumptions: |  |
Discount rate (as a percent) | 1.00% | 1.00%
Average rate of increase in compensation levels (as a percent) | 1.00% |
Foreign Pension Plans | High end of range |  |
Net Periodic Benefit Cost Assumptions: |  |
Discount rate (as a percent) | 10.80% | 10.80%
Average rate of increase in compensation levels (as a percent) | 8.00% |
Postretirement Benefits |  |
Benefit Obligation Assumptions: |  |
Discount rate (as a percent) | 3.61% | 4.15%
Net Periodic Benefit Cost Assumptions: |  |
Discount rate (as a percent) | 4.15% | 4.36%
Net decrease in postretirement plan obligations | $ (9) |
Assumed healthcare cost trend rates |  |
Consumer Price Index (CPI) increase (as a percent) | 1.97% | 1.97%
Projected annual rates of healthcare cost trend rates (as a percent) | 8.00% |
Projected ultimate healthcare cost trend rates (as a percent) | 4.50% |
Year the projected healthcare cost trend rate reaches ultimate trend rate | 2025 |
Effect of 1-percent increase or a 1-percent decrease in these assumed healthcare cost trend rates |  |
Effect of 1-percent increase in assumed healthcare cost trend rates on postretirement benefit obligation | $ 42 |
Effect of 1-percent decrease in assumed healthcare cost trend rates on postretirement benefit obligation | $ 34 |

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of increase (decrease) in obligation for pension benefits. Includes, but is not limited to, defined benefit or defined contribution plans. Excludes other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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