POSTRETIREMENT BENEFIT PLANS - Narrative (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2025 |
Sep. 30, 2024 |
Sep. 30, 2025 |
Sep. 30, 2024 |
|
| Retirement Benefits [Abstract] | ||||
| Defined contribution plan costs | $ 33 | $ 29 | $ 119 | $ 110 |