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v3.25.1

TRANSFORMATION STRATEGY COSTS - Narrative (Details) position in Thousands, hour in Millions, $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2025 USD ($) position hour lease | Mar. 31, 2024 USD ($) | Dec. 31, 2023 position | Dec. 31, 2024 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring and related activities, term (less than) | 1 year |  |  |
Transformation cost | $ 58 | $ 46 |  |
Transformation 2.0 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Cost incurred to date | 814 |  |  |
Expected costs remaining | 75 |  |  |
Payments for restructuring | 33 |  |  |
Transformation cost | 16 | 21 |  |
Fit to Serve |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Cost incurred to date | 435 |  |  |
Expected costs remaining | 25 |  |  |
Expected number of positions eliminated | position |  |  | 14 |
Separation costs | 28 |  |  | $ 45
Transformation cost | $ 19 | 25 |  |
Network Reconfiguration and Efficiency Reimagined |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Expected number of positions eliminated | position | 20 |  |  |
Transformation cost | $ 23 | $ 0 |  |
Expected reduction in workforce hours | hour | 25 |  |  |
Expected number of buildings to be closed | lease | 73 |  |  |
Expected cost savings | $ 3,500 |  |  |
Costs saved | 500 |  |  |
Cost incurred to date | 23 |  |  |
Network Reconfiguration and Efficiency Reimagined | Minimum |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Expected costs remaining | 400 |  |  |
Network Reconfiguration and Efficiency Reimagined | Maximum |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Expected costs remaining | $ 600 |  |  |

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