PENSION AND OTHER POST-EMPLOYMENT BENEFIT PLANS - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Employer contributions and benefit payments	$ 37	$ 35	$ 31
Canadian Qualified Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Assets Transferred to (from) Plan			420
Non Registered Plans | Canada
Defined Benefit Plan Disclosure [Line Items]
Employer contributions and benefit payments	2
Expected contribution to benefit plans during 2025	2
Non Qualified Pension Plans Defined Benefit | U.S.
Defined Benefit Plan Disclosure [Line Items]
Employer contributions and benefit payments	10
Expected contribution to benefit plans during 2025	9
Maximum | Canada
Defined Benefit Plan Disclosure [Line Items]
Employer contributions and benefit payments	1
Maximum | Registered Pension Plans | Canada
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to benefit plans during 2025	1
Pension
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Payment for Settlement			$ 205
Employer contributions and benefit payments	12	14
Other Post-employment Benefits
Defined Benefit Plan Disclosure [Line Items]
Employer contributions and benefit payments	6	$ 6
Expected contribution to benefit plans during 2025	7
Other Post-employment Benefits | Collective Bargaining Arrangement
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to benefit plans during 2025	3
Other Post-employment Benefits | Canada
Defined Benefit Plan Disclosure [Line Items]
Employer contributions and benefit payments	1
Other Post-employment Benefits | U.S.
Defined Benefit Plan Disclosure [Line Items]
Employer contributions and benefit payments	$ 5