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POST-RETIREMENT BENEFITS - Post-employment Amounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of net defined benefit liability (asset) [line items]    
Liability in the balance sheet $ 42 $ 48
Income statement charge 1 1
Measurements (4) 23
Other post-retirement benefits    
Disclosure of net defined benefit liability (asset) [line items]    
Liability in the balance sheet 6 6
Income statement charge 0 0
Measurements $ 0 $ 0
Discount rate 4.45% 3.75%
Defined pension benefits    
Disclosure of net defined benefit liability (asset) [line items]    
Liability in the balance sheet $ 36 $ 42
Income statement charge 1 1
Measurements $ (4) $ 23
Defined pension benefits | Minimum    
Disclosure of net defined benefit liability (asset) [line items]    
Discount rate 2.90% 2.10%
Defined pension benefits | Maximum    
Disclosure of net defined benefit liability (asset) [line items]    
Discount rate 3.95% 3.90%
Defined pension benefits | Present value of obligations    
Disclosure of net defined benefit liability (asset) [line items]    
Liability in the balance sheet $ 36 $ 42
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 (8) (12)
Defined pension benefits | Funded plans | Present value of obligations    
Disclosure of net defined benefit liability (asset) [line items]    
Liability in the balance sheet 57 122
Defined pension benefits | Funded plans | Fair value of plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Liability in the balance sheet (65) (134)
Defined pension benefits | Unfunded plans | Present value of obligations    
Disclosure of net defined benefit liability (asset) [line items]    
Liability in the balance sheet $ 44 $ 54