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Income Taxes (Details) € in Millions |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 04, 2020 USD ($) | Aug. 15, 2017 USD ($) | May 31, 2020 USD ($) | Sep. 26, 2020 USD ($) | Sep. 28, 2019 | Sep. 26, 2020 USD ($) | Sep. 28, 2019 | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2010 USD ($) | Dec. 31, 2009 USD ($) | Aug. 22, 2019 USD ($) | Apr. 26, 2019 USD ($) | Nov. 29, 2018 EUR (€)
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective income tax rate reconciliation, percent |  |  |  | (21.10%) | 5.20% | 78.90% | 19.60% |  |  |  |  |  |  |
Income tax examination, debts subject to limit of deductibility of interest expense |  |  |  |  |  |  |  |  |  |  |  | $ 7,500,000,000 |  |
Interest rate cap on debts for U.S. Federal tax purposes, as percent of Applicable Federal Rate |  |  | 130.00% |  |  |  |  |  |  |  |  |  |  |
Income tax examination, reduction in blended interest rate due to cap for U.S. Federal tax purposes |  |  | 4.00% |  |  |  |  |  |  |  |  |  |  |
IRS notice of proposed audit adjustment to reduce deductible interest expense for fiscal years 2014 and 2015 |  |  | $ 480,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Income tax examination, estimated increase to tax expense from audit adjustment to fiscal years 2014 and 2015, excluding interest and penalties |  |  | 170,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Income tax examination, estimate of additional tax expense for the period from June 28, 2015 through December 31, 2019, excluding interest and penalties |  |  | $ 200,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Income tax examination, penalties and interest expense |  | $ 163,600,000 |  |  |  |  |  | $ 24,700,000 | $ 40,200,000 | $ 61,500,000 | $ 37,200,000 |  |  |
Cumulative deferred charge related to tax litigation |  |  |  | $ 101,800,000 |  | $ 101,800,000 |  |  |  |  |  |  |  |
Income tax overpayments applied to succeeding years |  |  |  | $ 29,700,000 |  | $ 29,700,000 |  |  |  |  |  |  |  |
Royalty conceded on all omeprazole sales as a percent of refund claims (percent) |  |  |  |  |  | 24.00% |  |  |  |  |  |  |  |
IRS notice of proposed adjustment amount from 2011,2012 and 2013 audit of Athena, including penalty |  |  |  |  |  |  |  |  |  |  |  |  | $ 843,000,000.0 |
IRS notice of proposed adjustment, penalty (percent) |  |  |  |  |  |  |  |  |  |  |  |  | 40.00% |
Revenue Commissioners, Ireland |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsettled audit assessment from income tax examination | € |  |  |  |  |  |  |  |  |  |  |  |  |  | € 1,636
Subsequent Event | Revenue Commissioners, Ireland |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period available to file appeal against the judgment of the High Court | 28 days |  |  |  |  |  |  |  |  |  |  |  |  |
Payment required before final determination of the judicial review case and appeal pending before the Tax Appeals Commission | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |

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