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RETIREMENT PLANS - Cash Flows (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2020
Pension | United States |  |
Estimate of benefits expected to be paid for company's pension and postretirement health care benefit plans: |  |
Contributions to plan | $ 120 |
Pension | International |  |
Estimate of benefits expected to be paid for company's pension and postretirement health care benefit plans: |  |
Estimated contribution to pension benefit plan during 2021 |  | $ 47
Pension | Non-qualified plan | United States |  |
Estimate of benefits expected to be paid for company's pension and postretirement health care benefit plans: |  |
Employer voluntary contribution to defined benefit plan |  | 0
Pension and Postretirement Health Care Benefit Plans |  |
Estimate of benefits expected to be paid for company's pension and postretirement health care benefit plans: |  |
2021 |  | 232
2022 |  | 262
2023 |  | 247
2024 |  | 253
2025 |  | 261
2026-2030 |  | $ 1,254

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