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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 29, 2019 | Jan. 02, 2022 | Dec. 29, 2019 | Jan. 02, 2022 | Jan. 03, 2021 | Dec. 29, 2019 | Oct. 31, 2020 | Oct. 31, 2019 | Dec. 30, 2018
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |
Effective tax rate reconciliation, net increase (decrease) in tax rate, percent |  |  |  | (2.50%) | 1.90% |  |  |  |
Deferred tax assets, tax basis increase of certain assets due to reorganization |  | $ 2,300 |  | $ 2,300 |  |  |  |  |
Increase (decrease) in deferred tax liabilities, global intangible low-taxed income (GILTI) |  |  |  | $ 1,700 |  |  |  |  |
Tax benefits from loss on capital assets |  | 1.30% |  | 1.30% | 1.20% | 0.30% |  |  |
Income tax expense recorded related to TRAF |  |  |  |  | $ 400 | $ 100 |  |  |
TRAF effect on tax rate |  |  |  |  | 2.60% | 0.60% |  |  |
Income tax expense related to change in tax rate from TRAF |  |  |  |  | $ 300 | $ 600 |  |  |
Deferred tax asset recorded related to TRAF |  |  |  |  | 450 | 900 |  |  |
Deferred tax expense related to TRAF |  |  |  |  | $ 300 | 450 |  |  |
Effective income tax rate reconciliation, deduction |  |  |  |  | 1.20% |  |  |  |
Effective tax rate reconciliation, litigation settlement, percent |  |  | (2.10%) |  |  |  |  |  |
Reversal of deferred tax liability |  |  |  |  |  | 600 |  |  |
Reversal of deferred tax asset |  |  |  |  |  | 200 |  |  |
Tax Cuts And Jobs Act Of 2017, foreign tax credits, net deferred tax expense (benefit) |  |  |  |  |  | $ (400) |  |  |
TJCA, foreign tax credit percent | 1.70% |  |  |  |  | (2.20%) |  |  |
Increase (decrease) in earnings before taxes, percent |  |  | (23.50%) |  |  |  |  |  |
TCJA, increase (decrease) in deferred tax asset | $ 300 |  |  |  |  |  |  |  |
Increase (decrease) in unrecognized tax benefits |  |  |  |  |  | $ 300 |  |  |
Effective tax rate reconciliation, unrecognized tax benefits, percent |  |  |  |  |  | 1.50% |  |  |
Unrecognized tax benefits | $ 3,853 | $ 3,323 | $ 3,853 | $ 3,323 | $ 3,373 | $ 3,853 |  |  | $ 3,326
Unrecognized tax benefits, interest on income tax expense |  |  |  | 44 | 32 | 50 |  |  |
Unrecognized tax benefits, interest on income taxes accrued |  | 512 |  | $ 512 | 468 |  |  |  |
State and Local Jurisdiction |  |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |
Effective tax rate reconciliation, net increase (decrease) in tax rate, percent |  |  |  | 2.70% |  |  |  |  |
Deferred tax assets, net |  | 600 |  | $ 600 |  |  |  |  |
Auris Health | Purchased in-process research and development(1) |  |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |
Impairment of intangible assets, excluding goodwill |  | $ 900 |  |  |  |  |  |  |
Effective income tax rate reconciliation, nondeductible expense, impairment losses, percent |  | 22.40% |  |  |  |  |  |  |
Internal Revenue Service (IRS) |  |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |
Payment on unrecognized tax benefit liability |  |  |  |  | 700 |  |  |  |
Pending Litigation |  |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |
Loss contingency, estimate of possible loss |  |  |  |  |  |  | $ 5,000 | $ 4,000 |
Consumer Health |  |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |
Litigation expense |  |  |  | 1,600 | 3,900 | 400 |  |  |
Pharmaceutical |  |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |
Litigation expense |  |  |  | 600 | $ 800 | $ 4,300 |  |  |
Talc |  |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |
Effective income tax rate reconciliation, litigation settlement, percent |  |  |  |  | 0.235 |  |  |  |
Talc | Consumer Health |  |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |
Litigation expense |  |  |  | $ 1,600 | $ 4,000 |  |  |  |
Effective income tax rate reconciliation, litigation settlement, percent |  |  |  | 0.235 |  |  |  |  |
Risperdal | Consumer Health |  |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |
Litigation expense |  |  |  | $ 800 |  |  |  |  |
Effective income tax rate reconciliation, litigation settlement, percent |  |  |  | 0.164 |  |  |  |  |
Opiods |  |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |
Effective income tax rate reconciliation, litigation settlement, percent |  |  |  |  | 0.214 |  |  |  |
Opiods | Pharmaceutical |  |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |
Litigation expense |  |  |  |  | $ 1,000 |  |  |  |

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