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RETIREMENT PLANS (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Other Postretirement Benefits Plan [Member]    
Components of net periodic benefit cost [Abstract]    
Service cost $ 0 $ 0
Interest cost 3 5
Expected return on assets (1) (1)
Prior service credit, net (9) (10)
Net periodic benefit (credit) cost (7) (6)
UNITED STATES | Pension Plan [Member]    
Components of net periodic benefit cost [Abstract]    
Service cost 7 7
Interest cost 9 14
Expected return on assets (32) (34)
Prior service credit, net 0 0
Net periodic benefit (credit) cost (16) (13)
Foreign Plan [Member] | Pension Plan [Member]    
Components of net periodic benefit cost [Abstract]    
Service cost 4 4
Interest cost 3 4
Expected return on assets (9) (8)
Prior service credit, net 0 0
Net periodic benefit (credit) cost $ (2) $ 0