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RETIREMENT AND POSTRETIREMENT BENEFIT PLANS - ASSUMPTIONS (Details) - USD ($) $ in Millions | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Aug. 31, 2019 | Aug. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Pension Benefits |  |  |  |  |  |
Benefit Obligation Assumptions: |  |  |  |  |  |
Discount rate | 3.10% | 4.09% |  |  | 3.10% | 4.09%
Net Periodic Benefit Cost Assumptions: |  |  |  |  |  |
Discount rate | 3.21% | 3.45% | 3.21% | 3.45% |  |
Assumed long-term rate of return on assets |  |  |  |  | 6.50% | 6.50%
Average rate of increase in compensation levels (as a percent) |  |  |  |  | 5.44% | 0.00%
Net decrease in pension plan obligations |  |  |  |  | $ 15 |
Postretirement Benefits |  |  |  |  |  |
Benefit Obligation Assumptions: |  |  |  |  |  |
Discount rate | 3.26% | 4.29% |  |  | 3.26% | 4.29%
Net Periodic Benefit Cost Assumptions: |  |  |  |  |  |
Discount rate | 3.41% | 4.14% | 3.41% | 3.61% |  |
Assumed long-term rate of return on assets |  |  |  |  | 0.00% | 0.00%
Average rate of increase in compensation levels (as a percent) |  |  |  |  | 0.00% | 0.00%
Net decrease in postretirement plan obligations |  |  |  |  | $ 9 |
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 |  |  |  |  | 131 |
Effect of 1-percent decrease in assumed healthcare cost trend rates on postretirement benefit obligation |  |  |  |  | 103 |
Effect of 1-percent increase in assumed healthcare cost trend rate on annual service and interest costs |  |  |  |  | 13 |
Effect of 1-percent decrease in assumed healthcare cost trend rate on annual service and interest costs |  |  |  |  | $ 9 |
Postretirement Benefits | MAPD |  |  |  |  |  |
Assumed healthcare cost trend rates |  |  |  |  |  |
Projected annual rates of healthcare cost trend rates, year two (as a percent) | 9.60% |  |  |  | 9.60% |
Projected annual rates of healthcare cost trend rates, year nine and beyond (as a percent) | 4.50% |  |  |  | 4.50% |
Postretirement Benefits | MAPD | Low end of range |  |  |  |  |  |
Assumed healthcare cost trend rates |  |  |  |  |  |
Health care cost trend rates for current year (as a percent) | 4.30% |  |  |  | 4.30% |
Projected annual rates of healthcare cost trend rates, next fiscal year (as a percent) | (7.70%) |  |  |  | (7.70%) |
Postretirement Benefits | MAPD | High end of range |  |  |  |  |  |
Assumed healthcare cost trend rates |  |  |  |  |  |
Health care cost trend rates for current year (as a percent) | 21.50% |  |  |  | 21.50% |
Projected annual rates of healthcare cost trend rates, next fiscal year (as a percent) | (6.20%) |  |  |  | (6.20%) |
Postretirement Benefits | Non-MAPD |  |  |  |  |  |
Assumed healthcare cost trend rates |  |  |  |  |  |
Projected annual rates of healthcare cost trend rates, year nine and beyond (as a percent) | 4.50% |  |  |  | 4.50% |
Postretirement Benefits | Non-MAPD | Low end of range |  |  |  |  |  |
Assumed healthcare cost trend rates |  |  |  |  |  |
Health care cost trend rates for current year (as a percent) | 6.70% |  |  |  | 6.70% |
Postretirement Benefits | Non-MAPD | High end of range |  |  |  |  |  |
Assumed healthcare cost trend rates |  |  |  |  |  |
Health care cost trend rates for current year (as a percent) | 7.50% |  |  |  | 7.50% |
Foreign | Low end of range |  |  |  |  |  |
Net Periodic Benefit Cost Assumptions: |  |  |  |  |  |
Discount rate |  |  |  |  | 1.00% | 1.00%
Average rate of increase in compensation levels (as a percent) |  |  |  |  | 1.00% |
Foreign | High end of range |  |  |  |  |  |
Net Periodic Benefit Cost Assumptions: |  |  |  |  |  |
Discount rate |  |  |  |  | 8.80% | 8.90%
Average rate of increase in compensation levels (as a percent) |  |  |  |  | 8.00% |

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