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Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Prepaid Expenses and Other Current Assets [Line Items] |  |
Prepaid maintenance, postage and insurance | $ 260 | $ 187
Other prepaid expenses | 276 | 236
Total prepaid expenses | 536 | 423
Net income tax receivables | 749 | 534
Other current assets | 685 | 737
Total other current assets | 2,727 | 1,921
Total prepaid expenses and other current assets | 3,263 | 2,344
Clover Capital |  |
Prepaid Expenses and Other Current Assets [Line Items] |  |
Cash advances | 291 | 269
Foreign Banks and Alliance Partners |  |
Prepaid Expenses and Other Current Assets [Line Items] |  |
Cash advances | $ 1,002 | $ 381

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