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EMPLOYEE BENEFITS - Summary of Plan Assets (Details) - Postretirement Benefits - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets $ 207 $ 206 $ 198
Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets 209 205  
Funds – Municipal/Provincial Bonds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets $ 12 13  
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List] Fair Value, Inputs, Level 1 [Member]    
Funds – Corporate Bonds Fund      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets $ 5 5  
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List] Fair Value, Inputs, Level 1 [Member]    
Federal Money Market Fund      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets $ 4 11  
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List] Fair Value, Inputs, Level 1 [Member]    
Corporate Bonds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets $ 89 102  
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List] Fair Value, Inputs, Level 2 [Member]    
Government/Municipal Bonds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets $ 14 8  
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List] Fair Value, Inputs, Level 2 [Member]    
Equity Funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets $ 85 66  
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List] Fair Value, Inputs, Level 2 [Member]    
Trust Assets and Liabilities, Net      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Plan assets $ (2) $ 1