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PENSION AND OTHER POST-EMPLOYMENT BENEFITS - Estimated Future Benefit Payments (Details) $ in Millions | Dec. 31, 2023 USD ($)
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Pension |
Estimated Future Benefit Payments |
2024 | $ 554
2025 | 562
2026 | 564
2027 | 569
2028 | 571
Years 2029-2033 | 2,877
OPEB |
Estimated Future Benefit Payments |
2024 | 49
2025 | 41
2026 | 40
2027 | 39
2028 | 37
Years 2029-2033 | 164
Defined Benefit Plan, Expected Future Prescription Drug Subsidy Receipt [Abstract] |
2024 | (1)
2025 | (1)
2026 | 0
2027 | 0
2028 | 0
Years 2029-2033 | $ (2)

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