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RETIREMENT BENEFITS - Narrative (Details) - Pension Benefits
$ in Millions
6 Months Ended
Jun. 30, 2026
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Defined benefit plan, expected future employer contributions $ 550
Payment for pension benefits 326
Defined Benefit Plan, Underfunded Plan  
Defined Benefit Plan Disclosure [Line Items]  
Defined benefit plan, expected future employer contributions 400
Payment for pension benefits $ 181