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POST-RETIREMENT BENEFITS - Other Post-Retirement Benefits (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
year
Dec. 31, 2017
USD ($)
year
Disclosure of net defined benefit liability (asset) [line items]    
Weighted average duration of defined benefit obligation | year 14 10
Estimate of contributions, Less than a year $ 8 $ 15
Estimate of contributions, between 1-2 years 8 15
Estimate of contributions, between 2-5 years 24 41
Estimate of contributions, over 5 years 144 205
Total 184 276
Defined pension benefits    
Disclosure of net defined benefit liability (asset) [line items]    
Estimate of contributions, Less than a year 7 14
Estimate of contributions, between 1-2 years 7 14
Estimate of contributions, between 2-5 years 22 39
Estimate of contributions, over 5 years 139 200
Total 175 267
Other post-retirement benefits    
Disclosure of net defined benefit liability (asset) [line items]    
Estimate of contributions, Less than a year 1 1
Estimate of contributions, between 1-2 years 1 1
Estimate of contributions, between 2-5 years 2 2
Estimate of contributions, over 5 years 5 5
Total $ 9 $ 9