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PENSION - Summary of Fair Value of Pension Plan Assets by Asset Category (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 1,466 $ 1,650 $ 1,617
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,203 1,383 $ 0
Subtotal      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,466 1,650  
Subtotal | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 13 19  
Subtotal | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 242 240  
Subtotal | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,203 1,383  
Subtotal | Not Subject to Leveling      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 8 8  
Global equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 75 79  
Global equity funds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Global equity funds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 75 79  
Global equity funds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Insurance contracts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,203 1,383  
Insurance contracts | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Insurance contracts | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Insurance contracts | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,203 1,383  
Governments      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 99 93  
Governments | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Governments | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 99 93  
Governments | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Corporate bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3 4  
Corporate bonds | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Corporate bonds | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3 4  
Corporate bonds | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Global fixed income at net asset value      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 57 63  
Global fixed income at net asset value | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Global fixed income at net asset value | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 57 63  
Global fixed income at net asset value | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 1  
Real estate | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Real estate | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1 1  
Real estate | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 14 8  
Other | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Other | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7 0  
Other | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Other | Not Subject to Leveling      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7 8  
Cash & cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 14 19  
Cash & cash equivalents | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 13 19  
Cash & cash equivalents | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Cash & cash equivalents | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Cash & cash equivalents | Not Subject to Leveling      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1    
Other assets and liabilities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 0 $ 0