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Investments - Narrative (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |
Available-for-sale debt securities | $ 0 |  | $ 0 |  | $ 0
Debt securities in an unrealized loss position | 1,600,000,000 |  | 1,600,000,000 |  | 777,000,000
Debt securities, unrealized loss |  |  | 19,000,000 |  | 16,000,000
Debt securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss | 475,000,000 |  | 475,000,000 |  | 283,000,000
Debt securities, continuous unrealized loss position, 12 months or longer | 17,000,000 |  | 17,000,000 |  | 14,000,000
Equity securities without readily determinable fair value, carrying value | 38,000,000 |  | 38,000,000 |  | $ 83,000,000
Impairment loss | 45,000,000 | $ 0 | 45,000,000 | $ 0 |
Upward adjustments |  | 0 |  | 0 |
Downward adjustments |  | $ 0 |  | $ 0 |
Cumulative downward adjustments for observable price changes and impairment | $ 101,000,000 |  | $ 101,000,000 |  |

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