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SUMMARY OF ACCOUNTING POLICIES - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Significant Accounting Policies [Line Items] |  |  |  |
Purchased transportation |  | $ (13,589) | $ (13,640) | $ (17,666)
Other expenses |  | (7,888) | (8,097) | (7,920)
Repairs and maintenance |  | 2,940 | 2,828 | 2,884
Restricted cash |  | 0 | 37 |
Inventories |  | 826 | 935 |
Capitalized interest |  | 121 | 118 |
Supplier finance program, obligation, sold to financial institutions |  | $ 515 | $ 504 | 806
Supplier Finance Program, Obligation, Statement of Financial Position [Extensible Enumeration] |  | Accounts payable | Accounts payable |
Payments for workers' compensation liability |  | $ 114 | $ 151 |
Self insurance reserve |  | 114 | 153 |
Gain (loss) on self insurance reserves |  |  | 2 |
Net currency transaction gains and (losses), pre-tax |  | (38) | (53) | 72
Obligation, sold |  | $ 515 | 504 |
Revision of Prior Period, Reclassification, Adjustment |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Purchased transportation |  |  | 11 | 9
Other expenses |  |  | $ (7) | $ (5)
ITALY |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Miscellaneous taxes | $ 94 |  |  |
Ratably Vesting Awards |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Employee share-based awards, vesting period |  | 5 years |  |
Minimum | Cliff Vesting Awards |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Employee share-based awards, vesting period |  | 1 year |  |
Minimum | Other Intangible Assets |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Finite-lived intangible assets, estimated useful lives range, minimum |  | 2 years |  |
Minimum | Capitalized software |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Finite-lived intangible assets, estimated useful lives range, minimum |  | 7 years |  |
Minimum | Aircraft |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, estimated useful lives range |  | 7 years |  |
Minimum | Buildings |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, estimated useful lives range |  | 10 years |  |
Minimum | Plant equipment |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, estimated useful lives range |  | 3 years |  |
Minimum | Technology equipment |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, estimated useful lives range |  | 3 years |  |
Minimum | Vehicles |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, estimated useful lives range |  | 5 years |  |
Maximum | Cliff Vesting Awards |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Employee share-based awards, vesting period |  | 3 years |  |
Maximum | Other Intangible Assets |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Finite-lived intangible assets, estimated useful lives range, minimum |  | 21 years |  |
Maximum | Aircraft |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, estimated useful lives range |  | 40 years |  |
Maximum | Buildings |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, estimated useful lives range |  | 40 years |  |
Maximum | Plant equipment |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, estimated useful lives range |  | 20 years |  |
Maximum | Technology equipment |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, estimated useful lives range |  | 10 years |  |
Maximum | Vehicles |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Property, plant and equipment, estimated useful lives range |  | 15 years |  |

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