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BUSINESS OPTIMIZATION CHARGES - Summary of Business Optimization Charges (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Restructuring Cost and Reserve [Line Items]        
Restructuring charges $ 10 $ 7 $ 35 $ 32
Business Optimization Programs        
Restructuring Cost and Reserve [Line Items]        
Restructuring charges 10 7 35 32
Costs to implement business optimization programs 8 6 10 13
Total business optimization charges $ 18 $ 13 $ 45 $ 45