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RETIREMENT PLANS (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Other Postretirement Benefits Plan [Member]        
Components of net periodic benefit cost [Abstract]        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 3 5 9 14
Expected return on assets (1) (2) (3) (4)
Prior service credit, net (9) (9) (28) (28)
Net periodic benefit (credit) cost (7) (6) (22) (18)
UNITED STATES | Pension Plan [Member]        
Components of net periodic benefit cost [Abstract]        
Service cost 7 6 20 19
Interest cost 9 15 27 43
Expected return on assets (31) (34) (94) (101)
Prior service credit, net 0 0 0 0
Net periodic benefit (credit) cost (15) (13) (47) (39)
Foreign Plan [Member] | Pension Plan [Member]        
Components of net periodic benefit cost [Abstract]        
Service cost 5 5 14 13
Interest cost 3 4 9 11
Expected return on assets (9) (9) (28) (25)
Prior service credit, net (1) 0 (1) 0
Net periodic benefit (credit) cost $ (2) $ 0 $ (6) $ (1)