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TRANSFORMATION STRATEGY COSTS - Additional Information (Details) position in Thousands, $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) position | Dec. 31, 2024 USD ($) | Jan. 31, 2025 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring And related activities, term (less than) |  |  | 1 year |
Transformation 2.0 |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Initial savings | $ 400 |  | $ 400 |
Additional expected savings | 240 |  | 240 |
Costs incurred to date |  |  | 798 |
Expected remaining costs | 90 |  | 90 |
Fit to Serve |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Costs incurred to date |  |  | 416 |
Expected remaining costs | 45 |  | 45 |
Expected number of positions eliminated | position |  | 14 |  |
Restructuring reserve | 45 | $ 205 | $ 45 |
Network Reconfiguration | Subsequent Event |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Percent of anticipated building closures (up to) |  |  |  | 10.00%
Network Reconfiguration and Efficiency Reimagined |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Expected volume delivery decline, percent |  |  | 50.00% |
Efficiency Reimagined |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Costs incurred to date | $ 35 |  |  |
Efficiency Reimagined | Subsequent Event |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Initial savings |  |  |  | $ 1,000
Efficiency Reimagined | Minimum | Subsequent Event |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Expected remaining costs |  |  |  | 300
Efficiency Reimagined | Maximum | Subsequent Event |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Expected remaining costs |  |  |  | $ 400

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