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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2023
Fair Value Disclosures [Abstract] |
Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis | The following tables summarize the types of assets and liabilities measured at fair value on a recurring basis by level within the fair value hierarchy (in millions):
Fair value measurement as of September 30, 2023 |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets |  |  |  |  |  |  |  |
Money market funds |  | $ | 110 |  |  | $ | — |  |  | $ | — |  |  | $ | 110 |
U.S. treasury securities |  | — |  |  | 245 |  |  | — |  |  | 245 |
Corporate securities and commercial paper |  | — |  |  | 491 |  |  | — |  |  | 491 |
U.S. government agency obligations |  | — |  |  | 96 |  |  | — |  |  | 96 |
Certificate of deposit |  | — |  |  | 8 |  |  | — |  |  | 8 |
Total assets measured at fair value |  | $ | 110 |  |  | $ | 840 |  |  | $ | — |  |  | $ | 950 |
Liabilities |  |  |  |  |  |  |  |
Liability for sale of future royalties |  | $ | — |  |  | $ | — |  |  | $ | 19 |  |  | $ | 19 |
Total liabilities measured at fair value |  | $ | — |  |  | $ | — |  |  | $ | 19 |  |  | $ | 19 |
Fair value measurement as of December 31, 2022 |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets |  |  |  |  |  |  |  |
Money market funds |  | $ | 169 |  |  | $ | — |  |  | $ | — |  |  | $ | 169 |
U.S. treasury securities |  | — |  |  | 314 |  |  | — |  |  | 314 |
Corporate securities and commercial paper |  | — |  |  | 631 |  |  | — |  |  | 631 |
U.S. government agency securities |  | — |  |  | 20 |  |  | — |  |  | 20 |
Certificate of deposit |  | — |  |  | 4 |  |  | — |  |  | 4 |
Total assets measured at fair value |  | $ | 169 |  |  | $ | 969 |  |  | $ | — |  |  | $ | 1,138 |
Liabilities |  |  |  |  |  |  |  |
Liability for sale of future royalties |  | $ | — |  |  | $ | — |  |  | $ | 17 |  |  | $ | 17 |
Total liabilities measured at fair value |  | $ | — |  |  | $ | — |  |  | $ | 17 |  |  | $ | 17 |
Summary of Changes of Liabilities for Sale of Future Royalties | The liability for sale of future royalties is reported in Other noncurrent liabilities in the Condensed Consolidated Balance Sheets and changes were as follows (in millions):
| Nine Months Ended September 30,
| 2023 |  | 2022
Beginning balance | $ | 17 |  |  | $ | 5 |
Cash received | — |  |  | 5 |
Interest accretion | 2 |  |  | 2 |
Ending balance | $ | 19 |  |  | $ | 12 |

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