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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