v3.26.1
POSTRETIREMENT BENEFIT PLANS - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Defined Benefit Plan Disclosure [Line Items]          
Defined contribution plan costs   $ 56 $ 51 $ 98 $ 86
Principal pension          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan, contributions by employer $ 516