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Basis of Presentation (Tables) | 9 Months Ended
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Sep. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of Cash and Cash Equivalents | Cash, cash equivalents and restricted cash are included in the following line items in the condensed consolidated balance sheets:
| At September 30, |  | At December 31, |  | Increase / (Decrease)
(dollars in millions) | 2025 |  | 2024 |
Cash and cash equivalents | $ | 7,706 |  |  | $ | 4,194 |  |  | $ | 3,512 |
Restricted cash: |  |  |  |  |
Prepaid expenses and other | 303 |  |  | 319 |  |  | (16) |
Other assets | 147 |  |  | 122 |  |  | 25 |
Cash, cash equivalents and restricted cash | $ | 8,156 |  |  | $ | 4,635 |  |  | $ | 3,521 |
Schedule of Restricted Cash | Cash, cash equivalents and restricted cash are included in the following line items in the condensed consolidated balance sheets:
| At September 30, |  | At December 31, |  | Increase / (Decrease)
(dollars in millions) | 2025 |  | 2024 |
Cash and cash equivalents | $ | 7,706 |  |  | $ | 4,194 |  |  | $ | 3,512 |
Restricted cash: |  |  |  |  |
Prepaid expenses and other | 303 |  |  | 319 |  |  | (16) |
Other assets | 147 |  |  | 122 |  |  | 25 |
Cash, cash equivalents and restricted cash | $ | 8,156 |  |  | $ | 4,635 |  |  | $ | 3,521 |

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