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PENSION AND OTHER POST-EMPLOYMENT BENEFIT PLANS - Net Pension Plan Assets, by Fair Value Hierarchy (Details) - Pension - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Cash and short-term investments | Qualified and Registered Plans | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets $ 82 $ 73
Cash and short-term investments | Non Registered Plans | Canada    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 5 5
Public equity investments | Qualified and Registered Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 17 18
Fixed Income Investments, Corporate | Qualified and Registered Plans | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 907 874
Fixed Income Investments, Government | Qualified and Registered Plans | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 337 316
Fixed Income Investments, Repurchase Agreements | Qualified and Registered Plans | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets (25) (12)
Hedge funds and related investments | Qualified and Registered Plans | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 21 16
Private equity and related investments | Qualified and Registered Plans | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 26 34
Derivative instruments, net | Qualified and Registered Plans | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 1 0
Pension trust investments measured at fair value | Qualified and Registered Plans | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 1,366 1,319
Public equity investments | Non Registered Plans | Canada    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 4 3
Canadian nonregistered plan assets measured at fair value | Non Registered Plans | Canada    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 9 8
Pension plans defined benefit excluding hedge fund and private equity investments and accrued liabilities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 1,375 1,327
Fair Value, Inputs, Level 1 | Cash and short-term investments | Qualified and Registered Plans | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 82 73
Fair Value, Inputs, Level 1 | Cash and short-term investments | Non Registered Plans | Canada    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 5 5
Fair Value, Inputs, Level 1 | Public equity investments | Qualified and Registered Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 17 18
Fair Value, Inputs, Level 1 | Fixed Income Investments, Corporate | Qualified and Registered Plans | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 0 0
Fair Value, Inputs, Level 1 | Fixed Income Investments, Government | Qualified and Registered Plans | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 0 0
Fair Value, Inputs, Level 1 | Fixed Income Investments, Repurchase Agreements | Qualified and Registered Plans | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 0 0
Fair Value, Inputs, Level 1 | Hedge funds and related investments | Qualified and Registered Plans | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 0 0
Fair Value, Inputs, Level 1 | Private equity and related investments | Qualified and Registered Plans | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 0 0
Fair Value, Inputs, Level 1 | Derivative instruments, net | Qualified and Registered Plans | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 0 0
Fair Value, Inputs, Level 1 | Pension trust investments measured at fair value | Qualified and Registered Plans | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 99 91
Fair Value, Inputs, Level 1 | Public equity investments | Non Registered Plans | Canada    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 4 3
Fair Value, Inputs, Level 1 | Canadian nonregistered plan assets measured at fair value | Non Registered Plans | Canada    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 9 8
Fair Value, Inputs, Level 2 | Cash and short-term investments | Qualified and Registered Plans | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 0 0
Fair Value, Inputs, Level 2 | Cash and short-term investments | Non Registered Plans | Canada    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 0 0
Fair Value, Inputs, Level 2 | Public equity investments | Qualified and Registered Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 0 0
Fair Value, Inputs, Level 2 | Fixed Income Investments, Corporate | Qualified and Registered Plans | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 907 874
Fair Value, Inputs, Level 2 | Fixed Income Investments, Government | Qualified and Registered Plans | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 337 316
Fair Value, Inputs, Level 2 | Fixed Income Investments, Repurchase Agreements | Qualified and Registered Plans | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets (25) (12)
Fair Value, Inputs, Level 2 | Hedge funds and related investments | Qualified and Registered Plans | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 0 0
Fair Value, Inputs, Level 2 | Private equity and related investments | Qualified and Registered Plans | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 0 0
Fair Value, Inputs, Level 2 | Derivative instruments, net | Qualified and Registered Plans | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 1 0
Fair Value, Inputs, Level 2 | Pension trust investments measured at fair value | Qualified and Registered Plans | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 1,220 1,178
Fair Value, Inputs, Level 2 | Public equity investments | Non Registered Plans | Canada    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 0 0
Fair Value, Inputs, Level 2 | Canadian nonregistered plan assets measured at fair value | Non Registered Plans | Canada    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 0 0
Fair Value, Inputs, Level 3 | Cash and short-term investments | Qualified and Registered Plans | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 0 0
Fair Value, Inputs, Level 3 | Cash and short-term investments | Non Registered Plans | Canada    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 0 0
Fair Value, Inputs, Level 3 | Public equity investments | Qualified and Registered Plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 0 0
Fair Value, Inputs, Level 3 | Fixed Income Investments, Corporate | Qualified and Registered Plans | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 0 0
Fair Value, Inputs, Level 3 | Fixed Income Investments, Government | Qualified and Registered Plans | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 0 0
Fair Value, Inputs, Level 3 | Fixed Income Investments, Repurchase Agreements | Qualified and Registered Plans | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 0 0
Fair Value, Inputs, Level 3 | Hedge funds and related investments | Qualified and Registered Plans | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 21 16
Fair Value, Inputs, Level 3 | Private equity and related investments | Qualified and Registered Plans | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 26 34
Fair Value, Inputs, Level 3 | Derivative instruments, net | Qualified and Registered Plans | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 0 0
Fair Value, Inputs, Level 3 | Pension trust investments measured at fair value | Qualified and Registered Plans | U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 47 50
Fair Value, Inputs, Level 3 | Public equity investments | Non Registered Plans | Canada    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets 0 0
Fair Value, Inputs, Level 3 | Canadian nonregistered plan assets measured at fair value | Non Registered Plans | Canada    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of net plan assets $ 0 $ 0