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RESTRUCTURING AND OTHER COSTS - RESTRUCTURING ACCRUALS (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Restructuring Reserve    
Beginning balance $ 34 $ 30
Provisions and adjustments 29 36
Amounts applied (35) (23)
Change in estimates (10) (9)
Ending balance 18 34
Severance    
Restructuring Reserve    
Beginning balance 29 27
Provisions and adjustments 19 32
Amounts applied (25) (21)
Change in estimates (9) (9)
Ending balance 14 29
Severance | 2018 and Prior Plans    
Restructuring Reserve    
Beginning balance 5 7
Provisions and adjustments   2
Amounts applied   (4)
Change in estimates   0
Ending balance   5
Severance | 2019 Plans    
Restructuring Reserve    
Beginning balance 7 20
Provisions and adjustments   2
Amounts applied   (8)
Change in estimates   (7)
Ending balance   7
Severance | 2019 and Prior Plans    
Restructuring Reserve    
Beginning balance 12  
Provisions and adjustments 3  
Amounts applied (10)  
Change in estimates (2)  
Ending balance 3 12
Severance | 2020 Plans    
Restructuring Reserve    
Beginning balance 17 0
Provisions and adjustments 3 28
Amounts applied (11) (9)
Change in estimates (7) (2)
Ending balance 2 17
Severance | 2021 Plans    
Restructuring Reserve    
Beginning balance 0  
Provisions and adjustments 13  
Amounts applied (4)  
Change in estimates 0  
Ending balance 9 0
Other Restructuring Costs    
Restructuring Reserve    
Beginning balance 5 3
Provisions and adjustments 10 4
Amounts applied (10) (2)
Ending balance 4 5
Other Restructuring Costs | 2018 and Prior Plans    
Restructuring Reserve    
Beginning balance 3 3
Provisions and adjustments   0
Amounts applied   0
Ending balance   3
Other Restructuring Costs | 2019 Plans    
Restructuring Reserve    
Beginning balance 0 0
Provisions and adjustments   1
Amounts applied   (1)
Ending balance   0
Other Restructuring Costs | 2019 and Prior Plans    
Restructuring Reserve    
Beginning balance 3  
Provisions and adjustments 2  
Amounts applied (2)  
Ending balance 3 3
Other Restructuring Costs | 2020 Plans    
Restructuring Reserve    
Beginning balance 2 0
Provisions and adjustments 5 3
Amounts applied (5) (1)
Ending balance 1 2
Other Restructuring Costs | 2021 Plans    
Restructuring Reserve    
Beginning balance 0  
Provisions and adjustments 3  
Amounts applied (3)  
Ending balance $ 0 $ 0