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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 | Sep. 30, 2025 | Dec. 31, 2024
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Prepaid Expenses and Other Current Assets [Line Items] |  |
Prepaid maintenance, postage and insurance | $ 302 | $ 216
Other prepaid expenses | 258 | 188
Total prepaid expenses | 560 | 404
Income tax receivables | 278 | 501
Other current assets | 874 | 700
Total other current assets | 3,037 | 2,683
Total prepaid expenses and other current assets | 3,597 | 3,087
Clover Capital and Other |  |
Prepaid Expenses and Other Current Assets [Line Items] |  |
Cash advances | 513 | 381
Foreign Banks and Alliance Partners |  |
Prepaid Expenses and Other Current Assets [Line Items] |  |
Cash advances | $ 1,372 | $ 1,101

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