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Investments - Equity Investments (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Increase (Decrease) In Equity Investments [Roll Forward] |  |  |
Marketable securities, beginning balance | $ 506 |  |
Nonmarketable securities, beginning balance | 1,223 |  |
Total equity investments, beginning balance | 1,729 |  |
Marketable securities, purchases | 0 |  |
Nonmarketable securities, purchases | 42 |  |
Total equity investments, purchases | 42 |  |
Marketable securities, sales | (104) |  |
Nonmarketable securities, sales | (21) |  |
Total equity investments, sales | (125) |  |
Marketable securities, changes in fair value | (28) |  |
Nonmarketable securities, changes in fair value | (1) |  |
Total equity investments, changes in fair value | (29) | $ (61) | $ (145)
Marketable securities, other | (137) |  |
Nonmarketable securities, other | 127 |  |
Total equity investments, other | (10) |  |
Marketable securities, ending balance | 237 | 506 |
Nonmarketable securities, ending balance | 1,370 | 1,223 |
Total equity investments, ending balance | $ 1,607 | $ 1,729 |

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