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POSTRETIREMENT BENEFIT PLANS - Narrative (Details)
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
category
Mar. 31, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]    
Number of categories | category 3  
Defined contribution plan costs $ 95 $ 101
Other pension plans    
Defined Benefit Plan Disclosure [Line Items]    
Threshold to be included in other pension plans 50  
Plans cost (income) 10 7
Curtailment/settlement loss (gain) 1 (9)
Principal retiree benefit plans    
Defined Benefit Plan Disclosure [Line Items]    
Plans cost (income) (32) $ (61)
Curtailment/settlement loss (gain) $ (33)