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Acquisitions, Research Collaborations and License Agreements (Details) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 14 Months Ended | 20 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jan. 31, 2023 | Jun. 30, 2023 | Feb. 28, 2023 | Jan. 31, 2023 | May 31, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Dec. 31, 2023
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Research and development |  |  |  |  |  | $ 13,321 | $ 2,798 | $ 17,597 | $ 5,374 |  |
Prometheus Biosciences, Inc. |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consideration transferred, asset acquisition |  | $ 11,000 |  |  |  |  |  |  |  |  |
Consideration transferred, to settle share-based equity awards |  | 1,200 |  |  |  |  |  |  |  |  |
Consideration transferred, to settle equity awards, unvested |  | 700 |  |  |  |  |  |  |  |  |
Net assets acquired |  | 877 |  |  |  |  |  |  |  |  |
Cash recorded for asset acquisition |  | 368 |  |  |  |  |  |  |  |  |
Investments recorded for asset acquisition |  | 296 |  |  |  |  |  |  |  |  |
Deferred tax assets recorded for asset acquisition |  | 218 |  |  |  |  |  |  |  |  |
Other net liabilities recorded for asset acquisition |  | $ 5 |  |  |  |  |  |  |  |  |
Research and development |  |  |  |  |  | $ 10,200 |  | 10,200 |  |  |
Imago Bio Sciences, Inc. |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Consideration transferred, asset acquisition |  |  |  | $ 1,350 |  |  |  |  |  |  |
Net assets acquired | $ 219 |  |  |  |  |  |  |  |  |  |
Research and development |  |  |  |  |  |  |  | $ 1,200 |  |  |
Asset acquisition costs |  |  |  | 60 |  |  |  |  |  |  |
Sichuan Kelun-Biotech Biopharmaceutical Co., Ltd. | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Upfront and milestone payments made to collaborative partner |  |  | $ 175 |  |  |  | $ 30 |  | $ 30 |  |
Eligible future contingent development-related payments (up to) |  |  | 1,000 |  |  |  |  |  |  |  |
Eligible future contingent regulatory milestone payments (up to) |  |  | 2,800 |  |  |  |  |  |  |  |
Eligible future contingent sales-based milestone payments (up to) |  |  | $ 5,500 |  |  |  |  |  |  |  |
Preferred stock investment in counterparty | $ 100 |  |  | $ 100 |  |  |  |  |  |  |
Milestone payments to be made to a collaborative partner |  |  |  |  | $ 30 |  |  |  |  |  |
Milestone payment to be made to a collaborative partner |  |  |  |  | 25 |  |  |  |  |  |
Research and development payments made to a collaborative partner |  |  |  |  |  |  |  |  |  | $ 81 |
Sichuan Kelun-Biotech Biopharmaceutical Co., Ltd. | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Development Milestones |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Eligible future contingent development-related payments (up to) |  |  |  |  | 90 |  |  |  |  |  |
Sichuan Kelun-Biotech Biopharmaceutical Co., Ltd. | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | First Commercial Sale Milestones |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Eligible future contingent sales-based milestone payments (up to) |  |  |  |  | 290 |  |  |  |  |  |
Sichuan Kelun-Biotech Biopharmaceutical Co., Ltd. | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Sales-Based Milestones |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Eligible future contingent sales-based milestone payments (up to) |  |  |  |  | $ 780 |  |  |  |  |  |
Sichuan Kelun-Biotech Biopharmaceutical Co., Ltd. | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Forecast |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Research and development payments to be made to a collaborative partner |  |  |  |  |  |  |  |  |  |  | $ 111

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