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PENSION AND OTHER POSTRETIREMENT BENEFITS 4 (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2018
UNITED STATES |  |  |
Future Benefit Payments [Abstract] |  |  |
2020 | $ 1,159 |  |
2021 | 1,151 |  |
2022 | 1,145 |  |
2023 | 1,138 |  |
2024 | 1,128 |  |
2025-2029 | 5,353 |  |
Funding Policy Paragraph Details [Line Items] |  |  |
Pension notional amount | 4,463 |  | $ 2,808
Foreign Plan [Member] |  |  |
Future Benefit Payments [Abstract] |  |  |
2020 | 282 |  |
2021 | 288 |  |
2022 | 296 |  |
2023 | 303 |  |
2024 | 311 |  |
2025-2029 | 1,690 |  |
Funding Policy Paragraph Details [Line Items] |  |  |
Pension notional amount | 479 |  | $ 111
Cash pension contributions | $ 43 |  |
Foreign Plan [Member] | Forecast [Member] |  |  |
Funding Policy Paragraph Details [Line Items] |  |  |
Contributions to pension plans |  | $ 112 |
Other Postretirement Benefits [Member] |  |  |
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract] |  |  |
Health care cost trend rate assumed for next year | 7.00% |  | 7.00%
Rate that the cost trend rate gradually declines to | 5.00% |  | 5.00%
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rate [Abstract] |  |  |
Increase on service and interest | $ 1 |  |
Decrease on service and interest | (1) |  |
Increase on postretirement benefit obligation | 14 |  |
Decrease on postretirement benefit obligation | (12) |  |
Other Postretirement Benefits [Member] | Without Impact of Medicare Subsidy [Member] |  |  |
Future Benefit Payments [Abstract] |  |  |
2020 | 46 |  |
2021 | 42 |  |
2022 | 39 |  |
2023 | 36 |  |
2024 | 22 |  |
2025-2029 | 95 |  |
Other Postretirement Benefits [Member] | Net of Medicare Subsidy [Member] |  |  |
Future Benefit Payments [Abstract] |  |  |
2020 | 41 |  |
2021 | 38 |  |
2022 | 35 |  |
2023 | 32 |  |
2024 | 20 |  |
2025-2029 | $ 84 |  |

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