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Collaborative and Other Arrangements - Collaborative Arrangements Narrative (Details) € / shares in Units, € in Millions, shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 09, 2019 USD ($) shares | Nov. 06, 2019 € / shares shares | Aug. 23, 2019 USD ($) shares | Aug. 23, 2019 € / shares | Jul. 19, 2018 USD ($) | Jul. 19, 2018 EUR (€) | Jan. 19, 2016 USD ($) shares | Jan. 19, 2016 € / shares
Collaborative Arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepaid and other current assets |  | $ 1,606 |  |  | $ 1,440 | $ 1,606 |  |  |  |  |  |  |  |  |
Research and development expenses |  |  |  |  | 9,106 | 5,018 | $ 3,734 |  |  |  |  |  |  |  |
Goodwill |  | 4,117 |  |  | 4,117 | 4,117 |  |  |  |  |  |  |  |  |
Cost of goods sold |  |  |  |  | $ 4,675 | 4,853 | 4,371 |  |  |  |  |  |  |  |
Upfront collaboration and licensing expense [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Research and development expenses |  |  | $ 3,920 |  |  |  |  |  |  |  |  |  |  |  |
Gadeta [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangement-Potential Option Payout Upon Exercise | € |  |  |  |  |  |  |  |  |  |  |  |  | € 300 |  |
Indefinite-lived Intangible Assets Acquired |  |  |  | $ 117 |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest in Variable Interest Entity |  |  |  |  |  |  |  |  |  |  |  | $ 82 |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |
Janssen Pharmaceuticals [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price of goods less specified amount, maximum percentage |  |  |  |  | 30.00% |  |  |  |  |  |  |  |  |  |
Cost of goods sold |  |  |  |  | $ 574 | 608 | 561 |  |  |  |  |  |  |  |
Japan Tobacco [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived Intangible Assets Acquired |  |  |  |  |  | 550 |  |  |  |  |  |  |  |  |
Prepaid and other current assets |  | 9 |  |  |  | $ 9 |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  | 9 years |  |  |  |  |  |  |  |  |
Royalty Expense |  |  |  |  | 358 | $ 452 | 400 |  |  |  |  |  |  |  |
Initial Consideration for Acquisition of Rights to Market and Distribute Certain Products in Japan |  | 559 |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Management Contract Rights |  | $ 194 |  |  | 365 |  |  |  |  |  |  |  |  |  |
Galapagos [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Standstill Restricting Term | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale Securities, Equity Securities, Noncurrent |  |  |  |  |  |  |  | $ 586 |  | $ 1,130 |  |  |  | $ 357 |
Share Price | € / shares |  |  |  |  |  |  |  |  |  |  | € 140.59 |  |  |  | € 58
Investment Owned, Balance, Shares | shares |  |  |  |  |  |  |  | 16.7 | 2.6 | 6.8 |  |  |  | 6.8 |
Class of Warrant or Right, Exercise Price of Warrants or Rights | € / shares |  |  |  |  |  |  |  |  | € 140.59 |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  | 25.80% |  |  |  |  |  |  |
Maximum Ownership Percentage in Galapagos Based on the Terms of the Subscription Agreement |  |  |  |  |  |  |  |  |  | 29.90% |  |  |  |  |
Minimum Ownership Percentage in Galapagos Based on the Terms of the Subscription Agreement |  |  |  |  |  |  |  |  |  | 20.10% |  |  |  |  |
Potential Milestone for GLPG-1972 after Option Exercise |  |  |  |  | 640 |  |  |  |  | $ 750 |  |  |  |  |
Potential Future Sales-based Milestone |  |  |  |  | $ 600 |  |  |  |  |  |  |  |  |  |
Potential Future Tiered Royalty Payment Low-end |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |
Potential Future Tiered Royalty Payment High-end |  |  |  |  | 30.00% |  |  |  |  |  |  |  |  |  |
Payment for License, Option Rights and Equity Investments Upon Closing | $ 5,050 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance discount |  |  |  |  |  |  |  |  |  | 63 |  |  |  |  |
Potential Milestone Payment Upon Marketing Approval GLPG-1690 |  |  |  |  |  |  |  |  |  | 325 |  |  |  |  |
Potential Option Exercise Fee for GLPG-1972 |  |  |  |  |  |  |  |  |  | 250 |  |  |  |  |
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% |  |  |  |  |
Bristol-Myers-Squibb [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of goods sold |  |  |  |  | $ 58 | 198 |  |  |  |  |  |  |  |  |
Other Collaboration Arrangements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Up-front Collaboration and Licensing Expenses Related to Other Collaboration Arrangements That Are Not Individually Significant |  |  |  |  | 331 | 278 |  |  |  |  |  |  |  |  |
Cash Outflows Related to Other Collaboration Arrangements That Are Not Individually Significant |  |  |  |  | $ 467 | $ 474 | $ 0 |  |  |  |  |  |  |  |

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