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POST-RETIREMENT BENEFITS - Post-employment Amounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of net defined benefit liability (asset) [line items]    
Liability in the balance sheet $ (43) $ (43)
Income statement charge (1) 1
Measurements (4) (3)
Gains (losses) arising from settlements, net defined benefit liability (asset) 1  
Defined pension benefits    
Disclosure of net defined benefit liability (asset) [line items]    
Liability in the balance sheet (42) (39)
Income statement charge 2 1
Measurements $ (4) $ (5)
Defined pension benefits | Minimum    
Disclosure of net defined benefit liability (asset) [line items]    
Discount rate 1.95% 2.50%
Defined pension benefits | Maximum    
Disclosure of net defined benefit liability (asset) [line items]    
Discount rate 2.20% 3.30%
Defined pension benefits | Present value of obligations    
Disclosure of net defined benefit liability (asset) [line items]    
Liability in the balance sheet $ (42) $ (39)
Defined pension benefits | Impact of minimum funding requirement/asset ceiling    
Disclosure of net defined benefit liability (asset) [line items]    
Liability in the balance sheet 0 0
Defined pension benefits | Funded plans    
Disclosure of net defined benefit liability (asset) [line items]    
Liability in the balance sheet 5 7
Defined pension benefits | Funded plans | Present value of obligations    
Disclosure of net defined benefit liability (asset) [line items]    
Liability in the balance sheet 0 (69)
Defined pension benefits | Funded plans | Fair value of plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Liability in the balance sheet 5 76
Defined pension benefits | Unfunded plans | Present value of obligations    
Disclosure of net defined benefit liability (asset) [line items]    
Liability in the balance sheet (47) (46)
Other post-retirement benefits    
Disclosure of net defined benefit liability (asset) [line items]    
Liability in the balance sheet (1) (4)
Income statement charge (3) 0
Measurements $ 0 $ 2
Discount rate 2.25% 3.35%