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PENSIONS AND OTHER POSTRETIREMENT BENEFITS - Pension and Other Postretirement Benefits (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Pension Plan |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Service cost | $ 7 |  | $ 8 | $ 21 | $ 24
Interest cost | 54 |  | 59 | 163 | 176
Expected return on plan assets | (80) |  | (79) | (240) | (236)
Prior service credits | 5 |  | 5 | 13 | 13
Net actuarial loss (gain) | 0 |  | 0 | 0 | 2
Net periodic benefit costs (credits) | (14) |  | (7) | (43) | (21)
Defined benefit pension contributions | 75 |  | 0 | 91 | 0
Defined benefit plan |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |
Service cost | 2 |  | 2 | 6 | 7
Interest cost | 13 |  | 15 | 38 | 47
Expected return on plan assets | (11) |  | (10) | (32) | (31)
Termination benefits | 0 | $ 2 | 0 | 2 | 0
Prior service credits | (4) |  | (4) | (12) | (12)
Net actuarial loss (gain) | (39) |  | (36) | (116) | (109)
Net periodic benefit costs (credits) | (39) |  | (33) | (114) | (98)
OPEB contributions | $ 0 |  | $ 0 | $ 0 | $ 0

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