Financial Instruments - Narrative (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis | |||||
| Restricted cash equivalents | $ 13,554 | $ 13,554 | $ 2,539 | ||
| Accumulated unrealized gain (loss) on marketable debt securities, before tax | $ 300 | ||||
| Unrealized gain (loss) on marketable equity securities | (733) | $ (511) | (2,300) | $ (374) | |
| Money market funds | |||||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis | |||||
| Restricted cash equivalents | $ 10,800 | $ 10,800 | |||