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Summary of Basis of Presentation and Recent Accounting Standards (Tables) | 6 Months Ended
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Jun. 30, 2024
Accounting Policies [Abstract] |
Schedule of Components of Accumulated Other Comprehensive Income (Loss) | The components of accumulated other comprehensive loss for the three and six months ended June 30, 2024 were as follows (in millions):
| Unrealized Gains on Available-for-Sale Debt Securities |  |  |  | Pension and Postretirement Benefits |  | Total
Accumulated other comprehensive loss, balance at December 31, 2023 | $ | (114) |  |  |  |  | $ | (9) |  |  | $ | (123) |
Other comprehensive income | 22 |  |  |  |  | — |  |  | 22 |
Accumulated other comprehensive loss, balance at March 31, 2024 | (92) |  |  |  |  | (9) |  |  | (101) |
Other comprehensive income | 30 |  |  |  |  | — |  |  | 30 |
Accumulated other comprehensive loss, balance at June 30, 2024 | $ | (62) |  |  |  |  | $ | (9) |  |  | $ | (71) |
Schedule of Reconciliation of Cash and Cash Equivalents | The following table provides a reconciliation of cash, cash equivalents and restricted cash in the condensed consolidated balance sheets that sum to the total of the same such amounts shown in the condensed consolidated statements of cash flows (in millions):
|  | June 30,
|  | 2024 |  | 2023
Cash and cash equivalents |  | $ | 2,478 |  |  | $ | 3,801 |
Restricted cash, non-current(1) |  | 2 |  |  | 21 |
Total cash, cash equivalents and restricted cash shown in the condensed consolidated statements of cash flows |  | $ | 2,480 |  |  | $ | 3,822 |
_______ (1)Included in other non-current assets in the condensed consolidated balance sheets.
Schedule of Reconciliation of Restricted Cash | The following table provides a reconciliation of cash, cash equivalents and restricted cash in the condensed consolidated balance sheets that sum to the total of the same such amounts shown in the condensed consolidated statements of cash flows (in millions):
|  | June 30,
|  | 2024 |  | 2023
Cash and cash equivalents |  | $ | 2,478 |  |  | $ | 3,801 |
Restricted cash, non-current(1) |  | 2 |  |  | 21 |
Total cash, cash equivalents and restricted cash shown in the condensed consolidated statements of cash flows |  | $ | 2,480 |  |  | $ | 3,822 |
_______ (1)Included in other non-current assets in the condensed consolidated balance sheets.

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