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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Summary of Significant Accounting Policies [Line Items] |  |  |
Derivative contracts, net | $ 5,000,000 | $ 47,000,000 |
Depreciation and amortization expense related to property and equipment | 2,341,000,000 | 2,107,000,000 | $ 1,998,000,000
Amortization of capitalized software | 340,000,000 | 307,000,000 | 301,000,000
Net book value of capitalized software | 932,000,000 | 891,000,000 |
Fuel card obligation | 1,100,000,000 | 1,100,000,000 |
Advertising expense | 347,000,000 | 302,000,000 | $ 198,000,000
Fuel Card Obligation |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Purchasing card maximum limit | 1,100,000,000 |  |
Fuel card obligation | $ 1,100,000,000 | $ 1,100,000,000 |
Minimum |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Estimated residual value (percent) | 5.00% |  |
Maximum |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Estimated residual value (percent) | 10.00% |  |
Software and software development costs | Minimum |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Estimated useful life | 3 years |  |
Software and software development costs | Maximum |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |
Estimated useful life | 15 years |  |

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