EMPLOYEE BENEFIT PLANS AND POSTRETIREMENT BENEFITS - Narrative (Details) - US Retiree Medical Plan - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
Dec. 31, 2021 |
|
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | |||||
| Reduction of plan liability | $ 101 | ||||
| Amortization period of retirement benefits payable | 4 years | ||||
| Benefits modification amortization | $ 6 | $ 12 | $ 6 | $ 12 | |