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RESTRUCTURING, INTEGRATION, SEPARATION AND IPO COSTS - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Cost-rationalization and integration initiatives        
Separation and IPO-related costs included in selling, general and administrative expenses $ 653 $ 572 $ 1,944 $ 1,731
Restructuring and Integration Costs        
Cost-rationalization and integration initiatives        
Liabilities associated with restructuring, integration and separation costs $ 16   16  
Costs incurred     9 12
Restructuring payments     13 14
Separation and IPO Costs        
Cost-rationalization and integration initiatives        
Restructuring, integration, separation, and IPO costs     20 1
Separation and IPO-related costs included in selling, general and administrative expenses     $ 91 $ 4