ACQUISITIONS, COLLABORATIONS AND OTHER ARRANGEMENTS	3 Months Ended
ACQUISITIONS, COLLABORATIONS AND OTHER ARRANGEMENTS	Mar. 31, 2022
Business Combination and Asset Acquisition [Abstract]
ACQUISITIONS, COLLABORATIONS AND OTHER ARRANGEMENTS	ACQUISITIONS, COLLABORATIONS AND OTHER ARRANGEMENTS We enter into acquisitions, licensing and strategic collaborations and other similar arrangements with third parties for the development and commercialization of certain products and product candidates. The collaborations and other arrangements may involve two or more parties who are active participants in the operating activities of the collaboration and are exposed to significant risks and rewards depending on the commercial success of the activities. These arrangements may include non-refundable upfront payments, expense reimbursements or payments by us for options to acquire certain rights, contingent obligations by us for potential development and regulatory milestone payments and/or sales-based milestone payments, royalty payments, revenue or profit-sharing arrangements, cost-sharing arrangements and equity investments. We also have equity investments in third parties focused on the development and commercialization of products and product candidates. Acquisitions In the first quarter of 2021, we completed the acquisition of MYR, a German biotechnology company. MYR focuses on the development and commercialization of therapeutics for the treatment of HDV. The acquisition provided Gilead with Hepcludex, which was conditionally approved by the European Medicines Agency (“EMA”) in July 2020 for the treatment of chronic HDV infection in adults with compensated liver disease. MYR is a wholly-owned subsidiary of Gilead. The aggregate consideration for this acquisition of €1.3 billion (or $1.6 billion) primarily consisted of €1.0 billion (or $1.2 billion) paid upon closing and contingent consideration of up to €300 million, subject to customary adjustments, representing a potential future milestone payment upon FDA approval of Hepcludex. The fair value of this contingent liability, estimated using probability-weighted scenarios for FDA approval, was $341 million as of the acquisition date. The estimated fair value of the contingent liability was $322 million as of March 31, 2022. See Note 3. Fair Value Measurements for additional information. The acquisition of MYR was accounted for as a business combination using the acquisition method of accounting. Measurement period adjustments recorded to the fair values of assets acquired and liabilities assumed during the three months ended March 31, 2022 amounted to $18 million. See Note 7. Goodwill and Intangible Assets for additional information. The fair value estimates for the assets acquired and liabilities assumed have been completed. Collaborations and Other Arrangements Arcus In 2020, we entered into an option, license and collaboration agreement with Arcus (the “Arcus Collaboration Agreement”), which granted us the right to opt in to all current and future clinical-stage product candidates for up to ten years following the closing of the transaction. In November 2021, we exercised our options to three of the clinical-stage programs and amended the Arcus Collaboration Agreement. The option exercise and amendment transaction closed in December 2021, triggering collaboration opt-in payments of $725 million and waiving a $100 million option continuation payment which would have been due to Arcus in the third quarter of 2022. The collaboration opt-in payments of $725 million were recorded in Accrued and other current liabilities on our Consolidated Balance Sheets as of December 31, 2021 and paid to Arcus in January 2022. Our payments to Arcus were included in Other in investing activities on our Condensed Consolidated Statements of Cash Flows for the three months ended March 31, 2022.