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RETIREMENT PLANS (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Other Postretirement Benefits Plan [Member]        
Components of net periodic benefit cost [Abstract]        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 3 4 6 9
Expected return on assets (1) (1) (2) (2)
Prior service credit, net (10) (9) (19) (19)
Net periodic benefit (credit) cost (8) (6) (15) (12)
UNITED STATES | Pension Plan [Member]        
Components of net periodic benefit cost [Abstract]        
Service cost 6 6 13 13
Interest cost 9 14 18 28
Expected return on assets (31) (33) (63) (67)
Prior service credit, net 0 0 0 0
Net periodic benefit (credit) cost (16) (13) (32) (26)
Foreign Plan [Member] | Pension Plan [Member]        
Components of net periodic benefit cost [Abstract]        
Service cost 5 4 9 8
Interest cost 3 3 6 7
Expected return on assets (10) (8) (19) (16)
Prior service credit, net 0 0 0 0
Net periodic benefit (credit) cost $ (2) $ (1) $ (4) $ (1)