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PENSION - Summary of Fair Value of Pension Plan Assets by Asset Category (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 1,521 $ 1,466 $ 1,650
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,244 1,203 $ 1,383
Equities and Fixed Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,521 1,466  
Equities and Fixed Income Securities | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 17 13  
Equities and Fixed Income Securities | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 257 242  
Equities and Fixed Income Securities | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1,244 1,203  
Equities and Fixed Income Securities | Not Subject to Leveling      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3 8  
Global equity funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 61 75  
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 61 75  
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 1,244 1,203  
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 1,244 1,203  
Governments      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 110 99  
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 110 99  
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 4 3  
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 4 3  
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 71 57  
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 71 57  
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 8 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 8 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 6 14  
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 3 7  
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 3 7  
Cash & cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 17 14  
Cash & cash equivalents | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 17 13  
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 $ 0 $ 1