| Cover Page - USD ($) $ in Billions | 12 Months Ended | ||
| Dec. 31, 2019 | Apr. 27, 2020 | Jun. 30, 2019 | |
| Document Information [Line Items] | |||
| Document Type | 10-K/A | ||
| Amendment Flag | true | ||
| Amendment Description | This Amendment No. 1 to the Annual Report on Form 10-K (this “Amendment”) amends Part III, Items 10 through 14 of the previously filed Annual Report on Form 10-K for the fiscal year ended December 31, 2019, originally filed on February 18, 2020 (the “Original Filing”) by Allergan plc and Warner Chilcott Limited (collectively, “we,” “our,” “us,” the “Company” or “Allergan”). We are filing this Amendment to include information previously omitted from the Original Filing in reliance on General Instruction G(3) to Form 10-K, which provides that registrants may incorporate by reference certain information from a definitive proxy statement that involves the election of directors, provided that the definitive proxy statement is filed with the Securities and Exchange Commission (“SEC”) within 120 days after the end of the fiscal year. Due to the Company’s previously announced and pending transaction with AbbVie Inc. (the “AbbVie Transaction”), the Company does not anticipate that a definitive proxy statement that involves the election of directors will be filed within 120 days of the end of the Company’s fiscal year. Accordingly, Part III of the Original Filing is hereby amended as set forth below. In addition, as required by Rule 12b-15 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), new certifications by our principal executive officer and principal financial officer are filed as exhibits under Item 15 of Part IV to this Amendment. Except as stated herein, this Amendment does not reflect events occurring after the filing of the Original Filing and no attempt has been made in this Amendment to modify or update other disclosures presented in the Original Filing. Among other things, forward-looking statements made in the Original Filing have not been revised to reflect events that occurred or facts that became known to the Company after the filing of the Original Filing, and such forward-looking statements should be read in their historical context. Accordingly, this Amendment should be read in conjunction with the Original Filing and the Company’s other filings with the SEC subsequent to the filing of the Original Filing. | ||
| Document Period End Date | Dec. 31, 2019 | ||
| Document Fiscal Year Focus | 2019 | ||
| Document Fiscal Period Focus | FY | ||
| Entity File Number | 001-36867 | ||
| Entity Incorporation, State or Country Code | L2 | ||
| Entity Tax Identification Number | 98-1114402 | ||
| Entity Address, Address Line One | Clonshaugh Business and Technology Park | ||
| Entity Address, Address Line Two | Coolock | ||
| Entity Address, City or Town | Dublin | ||
| Entity Address, Country | IE | ||
| Entity Address, Postal Zip Code | E400 | ||
| City Area Code | 862 | ||
| Local Phone Number | 261-7000 | ||
| Entity Registrant Name | Allergan plc | ||
| Entity Central Index Key | 0001578845 | ||
| Current Fiscal Year End Date | --12-31 | ||
| Entity Well-known Seasoned Issuer | Yes | ||
| Entity Current Reporting Status | Yes | ||
| Entity Voluntary Filers | No | ||
| Entity Interactive Data Current | Yes | ||
| Entity Shell Company | false | ||
| Entity Filer Category | Large Accelerated Filer | ||
| Entity Small Business | false | ||
| Entity Emerging Growth Company | false | ||
| Entity Common Stock, Shares Outstanding | 329,765,537 | ||
| Entity Public Float | $ 54.8 | ||
| Document Annual Report | true | ||
| Document Transition Report | false | ||
| Allergan plc Ordinary Shares [Member] | |||
| Document Information [Line Items] | |||
| Trading Symbol | AGN | ||
| Title of 12(b) Security | Allergan plc Ordinary Shares, $0.0001 par value | ||
| Security Exchange Name | NYSE | ||
| Floating Rate Notes Due 2020 [Member] | |||
| Document Information [Line Items] | |||
| Trading Symbol | AGN20A | ||
| Title of 12(b) Security | Floating rate notes due 2020 | ||
| Security Exchange Name | NYSE | ||
| 0.500% Notes Due 2021 [Member] | |||
| Document Information [Line Items] | |||
| Trading Symbol | AGN21 | ||
| Title of 12(b) Security | 0.500% notes due 2021 | ||
| Security Exchange Name | NYSE | ||
| 1.500% Notes Due 2023 [Member] | |||
| Document Information [Line Items] | |||
| Trading Symbol | AGN 23A | ||
| Title of 12(b) Security | 1.500% notes due 2023 | ||
| Security Exchange Name | NYSE | ||
| 1.250% Notes Due 2024 [Member] | |||
| Document Information [Line Items] | |||
| Trading Symbol | AGN 24A | ||
| Title of 12(b) Security | 1.250% notes due 2024 | ||
| Security Exchange Name | NYSE | ||
| 2.625% Notes Due 2028 [Member] | |||
| Document Information [Line Items] | |||
| Trading Symbol | AGN28 | ||
| Title of 12(b) Security | 2.625% notes due 2028 | ||
| Security Exchange Name | NYSE | ||
| 2.125% Notes Due 2029 [Member] | |||
| Document Information [Line Items] | |||
| Trading Symbol | AGN29 | ||
| Title of 12(b) Security | 2.125% notes due 2029 | ||
| Security Exchange Name | NYSE | ||
| Warner Chilcott Limited [Member] | |||
| Document Information [Line Items] | |||
| Document Type | 10-K/A | ||
| Amendment Flag | true | ||
| Document Period End Date | Dec. 31, 2019 | ||
| Document Fiscal Year Focus | 2019 | ||
| Document Fiscal Period Focus | FY | ||
| Entity File Number | 001-36887 | ||
| Entity Incorporation, State or Country Code | D0 | ||
| Entity Tax Identification Number | 98-0496358 | ||
| Entity Address, Address Line One | Victoria Place | ||
| Entity Address, Address Line Two | 5th Floor | ||
| Entity Address, City or Town | Hamilton | ||
| Entity Address, Country | BM | ||
| Entity Address, Postal Zip Code | HM 10 | ||
| City Area Code | 441 | ||
| Local Phone Number | 295-2244 | ||
| Entity Registrant Name | Warner Chilcott Limited | ||
| Entity Central Index Key | 0001620602 | ||
| Current Fiscal Year End Date | --12-31 | ||
| Entity Well-known Seasoned Issuer | Yes | ||
| Entity Current Reporting Status | Yes | ||
| Entity Voluntary Filers | No | ||
| Entity Interactive Data Current | Yes | ||
| Entity Shell Company | false | ||
| Entity Filer Category | Non-accelerated Filer | ||
| Entity Small Business | false | ||
| Entity Emerging Growth Company | false |
