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POST-EMPLOYMENT BENEFITS - Sensitivity Analysis of Assumptions (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Defined benefit pension plan | Discount rate  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Increase in actuarial assumption, Impact on Liability $ (217)
Decrease in actuarial assumption, Impact on Liability $ 251
Defined benefit pension plan | Discount rate | Bottom of range  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Percentage increase 0.25%
Percentage decrease 0.25%
Defined benefit pension plan | Discount rate | Top of range  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Percentage increase 1.00%
Percentage decrease 1.00%
Defined benefit pension plan | Rate of compensation increase  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Increase in actuarial assumption, Impact on Liability $ 34
Decrease in actuarial assumption, Impact on Liability $ (31)
Defined benefit pension plan | Rate of compensation increase | Bottom of range  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Percentage increase 0.25%
Percentage decrease 0.25%
Defined benefit pension plan | Rate of compensation increase | Top of range  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Percentage increase 1.00%
Percentage decrease 1.00%
Post-retirement plan | Discount rate  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Increase in actuarial assumption, Impact on Liability $ (28)
Decrease in actuarial assumption, Impact on Liability $ 33
Post-retirement plan | Discount rate | Bottom of range  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Percentage increase 0.25%
Percentage decrease 0.25%
Post-retirement plan | Discount rate | Top of range  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Percentage increase 1.00%
Percentage decrease 1.00%
Post-retirement plan | Health care cost trend rates  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Increase in actuarial assumption, Impact on Liability $ 3
Decrease in actuarial assumption, Impact on Liability $ (2)
Post-retirement plan | Health care cost trend rates | Bottom of range  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Percentage increase 0.50%
Percentage decrease 0.50%
Post-retirement plan | Health care cost trend rates | Top of range  
Disclosure of sensitivity analysis for actuarial assumptions [line items]  
Percentage increase 1.00%
Percentage decrease 1.00%