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POST-RETIREMENT BENEFITS - Other Post-Retirement Benefits (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
year
Dec. 31, 2018
USD ($)
year
Disclosure of net defined benefit liability (asset) [line items]    
Weighted average duration of defined benefit obligation | year 9 14
Estimate of contributions, Less than a year $ 27 $ 8
Estimate of contributions, between 1-2 years 7 8
Estimate of contributions, between 2-5 years 21 24
Estimate of contributions, over 5 years 98 144
Total 153 184
Defined pension benefits    
Disclosure of net defined benefit liability (asset) [line items]    
Estimate of contributions, Less than a year 27 7
Estimate of contributions, between 1-2 years 7 7
Estimate of contributions, between 2-5 years 20 22
Estimate of contributions, over 5 years 95 139
Total 149 175
Other post-retirement benefits    
Disclosure of net defined benefit liability (asset) [line items]    
Estimate of contributions, Less than a year 0 1
Estimate of contributions, between 1-2 years 0 1
Estimate of contributions, between 2-5 years 1 2
Estimate of contributions, over 5 years 3 5
Total $ 4 $ 9