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Revenues - Additional Information (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | May 31, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contract with customer, excluding assessed tax |  |  |  | $ 32 | $ 33 | $ 86 | $ 78 |
Contract with customer, liability | $ 429 |  |  | 429 |  | 429 |  |
Total allocated transaction price |  |  |  |  |  | 35 |  |
Deferred revenue recognized |  |  |  | 28 | 33 | 79 | 78 |
Gilead Collaboration Agreement |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contract with customer, excluding assessed tax |  |  |  |  |  | 1 |  |
Contract with customer, liability |  |  |  |  |  |  |  | $ 452
R&D Activities for Domvanalimab |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contract with customer, excluding assessed tax |  |  |  | 1 |  | 3 | 2 |
Contract with customer, liability | 27 |  |  | 27 |  | 27 |  |
Deferred revenue recognized |  |  |  |  |  | 34 |  |
R&D and Commercialization Activities for Zimberelimab |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contract with customer, excluding assessed tax |  |  |  | 0 | 8 | 1 | 9 |
Deferred revenue recognized |  |  |  |  |  | 11 |  |
Access Rights and Option Continuation Periods |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contract with customer, excluding assessed tax |  |  |  | 8 | 8 | 25 | 25 |
Contract with customer, liability | 62 |  |  | 62 |  | 62 |  |
Gilead |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Capitalized contract cost, amortization |  |  |  |  |  | 1 | 1 |
Cost sharing receivable | 3 |  |  | 3 |  | 3 |  |
Gilead | Prepaid Expenses and Other Current Assets |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Capitalized contract cost, net, current | 1 |  |  | 1 |  | 1 |  |
Gilead | Other Noncurrent Assets |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Capitalized contract cost, net, noncurrent | 2 |  |  | 2 |  | 2 |  |
Gilead | Gilead Collaboration Agreement |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Upfront cash payment |  | $ 35 |  |  |  |  |  |
Total allocated transaction price |  |  | $ 35 |  |  |  |  |
Deferred revenue recognized |  |  |  |  |  | $ 121 |  |
Current and future programs exclusive access period |  |  |  |  |  | 10 years |  |
Contingent milestone payments receivable | 300 |  |  | 300 |  | $ 300 |  |
Option continuation payment receivable upon sixth anniversary of agreement | 100 |  |  | 100 |  | $ 100 |  |
Performance obligation period |  |  |  |  |  | 4 years |  |
Gilead | R&D Activities for Inflammation Programs |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contract with customer, excluding assessed tax |  |  |  | 2 |  | $ 3 |  |
Contract with customer, liability | 32 |  |  | 32 |  | 32 |  |
Gilead | Etrumadenant License and research and Development Services Agreement |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contract with customer, excluding assessed tax |  |  |  | 21 | 3 | 39 | 21 |
Contract with customer, liability | 146 |  |  | 146 |  | 146 |  |
Deferred revenue recognized |  |  |  |  |  | 219 |  |
Gilead | Quemliclustat, License and R&D services |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contract with customer, excluding assessed tax |  |  |  | (4) | $ 12 | 11 | $ 16 |
Contract with customer, liability | 138 |  |  | $ 138 |  | 138 |  |
Deferred revenue recognized |  |  |  |  |  | $ 176 |  |
Gilead | Revenue Benchmark | Customer Concentration Risk |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Percentage of revenues |  |  |  | 88.00% | 94.00% | 95.00% | 94.00% |
STAR-221 Development Activities | Taiho Collaboration Agreement |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |
Revenue from contract with customer, excluding assessed tax |  |  |  | $ 4 |  | $ 4 |  |
Contract with customer, liability | 24 |  |  | $ 24 |  | $ 24 |  |
Revenue recognized | $ 28 |  |  |  |  |  |  |

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