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EMPLOYEE BENEFIT PLANS - Changes in Pension Plan Level 3 Assets (Details) - Pension Plans - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Summary of changes in fair value of the pension plans' level 3 assets    
Fair value of plan assets at January 1 $ 1,481 $ 1,642
Return on plan assets:    
Fair value of plan assets at December 31 1,530 1,481
Level 3    
Summary of changes in fair value of the pension plans' level 3 assets    
Fair value of plan assets at January 1 355 437
Return on plan assets:    
Relating to assets still held at the reporting date 26 (47)
Purchases, sales, settlements and expenses 34 (35)
Fair value of plan assets at December 31 $ 415 $ 355