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Revenues (Tables) | 9 Months Ended
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Sep. 30, 2023
Revenue from Contract with Customer [Abstract] |
Summary of Revenues by Collaboration, Category of Revenue and Method of Recognition | The following table summarizes our revenues by collaboration, category of revenue, and the method of recognition (in millions):
|  |  | Three Months Ended September 30, |  | Nine Months Ended September 30,
| Over time | Point in time | 2023 |  | 2022 |  | 2023 |  | 2022
Gilead Collaboration |  |  |  |  |  |  |  |  |
License and R&D services | * |  | $ | 20 |  |  | $ | 23 |  |  | $ | 57 |  |  | $ | 48 |
Access rights | * |  | 8 |  |  | 8 |  |  | 25 |  |  | 25 |
Taiho Collaboration |  |  |  |  |  |  |  |  |
R&D services | * |  | 4 |  |  | — |  |  | 4 |  |  | — |
Access rights | * |  | — |  |  | 2 |  |  | — |  |  | 5 |
Total revenues |  |  | $ | 32 |  |  | $ | 33 |  |  | $ | 86 |  |  | $ | 78 |
Summary of Revenue Recognized as a Result of Changes in Deferred Revenue | The following table summarizes the revenue recognized as a result of changes in the deferred revenue balance (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2023 |  | 2022 |  | 2023 |  | 2022
Revenue recognized from amounts included in deferred revenue at the beginning of the period | $ | 28 |  |  | $ | 33 |  |  | $ | 79 |  |  | $ | 78 |
Summary of Transaction Price and Allocation of Transaction Price to the Performance Obligations | The following table summarizes the allocation of the transaction price to the distinct performance obligations (in millions):
Allocation to performance obligations |  | Distinct |  | Amount
Inflammation target 1 |  | * |  | $ | 18 |
Inflammation target 2 |  | * |  | 17 |
Total allocated transaction price |  |  |  | $ | 35 |

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