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POSTRETIREMENT BENEFIT PLANS - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
category
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
category
Jun. 30, 2020
USD ($)
Defined Benefit Plan Disclosure [Line Items]        
Number of categories | category 3   3  
Defined contribution plan costs $ 113 $ 87 $ 221 $ 182
Principal retiree benefit plans        
Defined Benefit Plan Disclosure [Line Items]        
Plans cost (income) (42) (22) (82) (54)
Other pension plans        
Defined Benefit Plan Disclosure [Line Items]        
Plans cost (income) $ 37 $ 2 13 $ 9
Curtailment loss     $ 77