Revenue from Contracts with Customers - Summary of Disaggregation of Revenues by Major Revenue Streams (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2023
Sanofi [Member] \| Collaborative Arrangement [Member]
Disaggregation of Revenue [Line Items]
Upfront payment	$ 500	$ 500

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details