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Investments - Other Equity Securities (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Equity securities | $ 6,819,000,000 |  | $ 6,819,000,000 |  | $ 4,188,000,000
Sale of unrealized gains (losses) on equity securities | 0 | $ 0 | 0 | $ 0 |
Increase and decrease in equity securities without readily determinable fair value, amount | 0 | 0 | 0 | 0 |
Sale of securities without readily determinable fair value | 0 | $ 0 | 0 | $ 0 |
Other Noncurrent Assets |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Equity securities | 300,000,000 |  | 300,000,000 |  | 314,000,000
Equity securities without readily determinable fair value | $ 339,000,000 |  | $ 339,000,000 |  | $ 319,000,000

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