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POST-EMPLOYMENT BENEFITS - Sensitivity Analysis of Assumptions (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Defined benefit pension plan | Discount rate    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage increase 1.00% 1.00%
Impact on liability $ (387) $ (472)
Percentage decrease 1.00% 1.00%
Impact on liability $ 473 $ 528
Defined benefit pension plan | Rate of compensation increase    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage increase 1.00% 1.00%
Impact on liability $ 38 $ 60
Percentage decrease 1.00% 1.00%
Impact on liability $ (34) $ (44)
Post-employment plan | Discount rate    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage increase 1.00% 1.00%
Impact on liability $ (6) $ (9)
Percentage decrease 1.00% 1.00%
Impact on liability $ 7 $ 11
Post-employment plan | Health care cost trend rates    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Percentage increase 1.00% 1.00%
Impact on liability $ 1 $ 2
Percentage decrease 1.00% 1.00%
Impact on liability $ (1) $ (1)