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Collaborative And Other Arrangements Narrative (Details) € / shares in Units, € in Millions, shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) shares | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) shares | Sep. 30, 2018 USD ($) | Oct. 31, 2019 EUR (€) € / shares shares | Aug. 23, 2019 USD ($) shares | Aug. 23, 2019 € / shares | Jan. 19, 2016 USD ($) shares | Jan. 19, 2016 € / shares
Collaborative and Other Arrangements [Line Items] |  |  |  |  |  |  |  |  |  |
Research and development expenses |  | $ 4,990 | $ 939 | $ 7,207 | $ 3,068 |  |  |  |  |
Galapagos [Member] |  |  |  |  |  |  |  |  |  |
Collaborative and Other Arrangements [Line Items] |  |  |  |  |  |  |  |  |  |
Investment owned, balance, shares | shares |  | 13.6 |  | 13.6 |  |  | 6.8 |  | 6.8 |
Share price | € / shares |  |  |  |  |  |  |  | € 140.59 |  | € 58
Contractual lock-up period | 5 years |  |  |  |  |  |  |  |  |
Equity securities, FV-NI, cost |  |  |  |  |  |  | $ 1,130 |  | $ 357 |
Payment for license, option rights and equity investments upon closing | $ 5,050 |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  | 22.00% |  |  |
Issuance discount |  |  |  |  |  |  | $ 63 |  |  |
Research and development expenses |  | $ 3,920 |  |  |  |  |  |  |  |
Potential milestone payment upon marketing approval GLPG-1690 |  |  |  |  |  |  | 325 |  |  |
Potential option exercise fee for GLPG-1972 |  |  |  |  |  |  | 250 |  |  |
Potential milestone payments for GLPG-1972 after option exercise |  |  |  |  |  |  | 750 |  |  |
Potential option exercise fee per program |  |  |  |  |  |  | $ 150 |  |  |
Potential sales based tiered royalty low-end |  |  |  |  |  |  | 20.00% |  |  |
Potential sales based tiered royalties high-end |  |  |  |  |  |  | 24.00% |  |  |
Maximum ownership percentage in Galapagos based on the terms of the subscription agreement |  |  |  |  |  |  | 29.90% |  |  |
Standstill restricting term | 10 years |  |  |  |  |  |  |  |  |
Minimum ownership percentage in Galapagos based on the terms of the subscription agreement |  |  |  |  |  |  | 20.10% |  |  |
Potential future development and regulatory milestone |  |  |  |  |  |  |  |  | 755 |
Potential future sales-based milestone |  |  |  |  |  |  |  |  | $ 600 |
Potential future tiered royalty payment low-end |  |  |  |  |  |  |  |  | 20.00% |
Potential future tiered royalty payment high-end |  |  |  |  |  |  |  |  | 30.00% |
Galapagos [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Collaborative and Other Arrangements [Line Items] |  |  |  |  |  |  |  |  |  |
Investment owned, balance, shares | shares |  |  |  |  |  | 16.2 |  |  |  |
Share price | € / shares |  |  |  |  |  | € 140.59 |  |  |  |
Equity securities, FV-NI, cost | € |  |  |  |  |  | € 368 |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  | 25.10% |  |  |  |
Warrant exercised, shares | shares |  |  |  |  |  | 2.6 |  |  |  |
Other Collaboration Arrangements [Member] |  |  |  |  |  |  |  |  |  |
Collaborative and Other Arrangements [Line Items] |  |  |  |  |  |  |  |  |  |
Cash outflows related to collaborative and other similar arrangements |  | 54 | 29 | $ 447 | 333 |  |  |  |  |
Up-front collaboration and licensing expenses related to collaborative and other similar arrangements |  | $ 40 | $ 0 | $ 331 | $ 160 |  |  |  |  |

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