License and Research Agreements - Schedule of Cost Sharing Payments (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Cost Sharing Payments [Line Items] | ||||
| Cost of sales | $ 34 | $ 23 | $ 64 | $ 52 |
| Kyowa Kirin Collaboration [Member] | ||||
| Cost Sharing Payments [Line Items] | ||||
| Research and development | (1) | (1) | (2) | (2) |
| Cost of sales | 19 | 12 | 35 | 31 |
| Regeneron Pharmaceuticals Inc | ||||
| Cost Sharing Payments [Line Items] | ||||
| Cost of sales | $ 6 | $ 2 | $ 12 | $ 5 |