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Investments - Equity Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Balance, beginning of period |  |  | $ 1,607 |
Purchases |  |  | 16 |
Sales |  |  | 0 |
Gains (losses) on equity investments, net | $ 4 | $ (13) | (25) | $ (7)
Other |  |  | 40 |
Balance, end of period | 1,638 |  | 1,638 |
Marketable Securities |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Balance, beginning of period |  |  | 237 |
Purchases |  |  | 0 |
Sales |  |  | 0 |
Gains (losses) on equity investments, net |  |  | (3) |
Other |  |  | 0 |
Balance, end of period | 234 |  | 234 |
Nonmarketable Securities |  |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |  |
Balance, beginning of period |  |  | 1,370 |
Purchases |  |  | 16 |
Sales |  |  | 0 |
Gains (losses) on equity investments, net |  |  | (22) |
Other |  |  | 40 |
Balance, end of period | $ 1,404 |  | $ 1,404 |

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