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RETIREMENT PLANS - Cash Flows (Details) - USD ($)
$ in Millions
1 Months Ended
Sep. 30, 2019
Sep. 30, 2017
Dec. 31, 2019
MEDICAL SUBSIDY RECEIPTS      
Defined Benefit Plan Expected Future Benefit Payments From Discontinued Operations     $ 2
Pension | United States      
MEDICAL SUBSIDY RECEIPTS      
Contributions to plan $ 120 $ 80  
Pension | International Pension      
MEDICAL SUBSIDY RECEIPTS      
Estimated contribution to pension benefit plan during 2020     46
U.S. Pension and Postretirement Health Care Benefits      
Estimate of benefits expected to be paid for company's pension and postretirement health care benefit plans:      
2020     253
2021     232
2022     263
2023     239
2024     251
2025-2029     $ 1,244