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POST-RETIREMENT BENEFITS - Post-employment Amounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of net defined benefit liability (asset) [line items]    
Liability in the balance sheet $ 43 $ 42
Income statement charge 1 1
Measurements (3) (4)
Other post-retirement benefits    
Disclosure of net defined benefit liability (asset) [line items]    
Liability in the balance sheet 4 6
Income statement charge 0 0
Measurements $ 2 $ 0
Discount rate 3.35% 4.45%
Defined pension benefits    
Disclosure of net defined benefit liability (asset) [line items]    
Liability in the balance sheet $ 39 $ 36
Income statement charge 1 1
Measurements $ (5) $ (4)
Defined pension benefits | Minimum    
Disclosure of net defined benefit liability (asset) [line items]    
Discount rate 2.50% 3.75%
Defined pension benefits | Maximum    
Disclosure of net defined benefit liability (asset) [line items]    
Discount rate 3.30% 4.65%
Defined pension benefits | Present value of obligations    
Disclosure of net defined benefit liability (asset) [line items]    
Liability in the balance sheet $ 39 $ 36
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 (7) (8)
Defined pension benefits | Funded plans | Present value of obligations    
Disclosure of net defined benefit liability (asset) [line items]    
Liability in the balance sheet 69 57
Defined pension benefits | Funded plans | Fair value of plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Liability in the balance sheet (76) (65)
Defined pension benefits | Unfunded plans | Present value of obligations    
Disclosure of net defined benefit liability (asset) [line items]    
Liability in the balance sheet $ 46 $ 44