Financial Instruments - Narrative (Details) - USD ($) $ in Millions |
3 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Dec. 31, 2025 |
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis | |||
| Restricted cash equivalents | $ 7,425 | $ 2,539 | |
| Accumulated unrealized gain (loss) on marketable debt securities, before tax | 129 | $ 300 | |
| Unrealized gain (loss) on marketable equity securities | (1,570) | $ 137 | |
| Money market funds | |||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis | |||
| Restricted cash equivalents | $ 5,000 | ||