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Savings Plan - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Jan. 03, 2021 | Dec. 29, 2019 | Dec. 30, 2018
Savings Plan [Abstract] |  |  |
Matching contributions | $ 243 | $ 235 | $ 242

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- Definition Savings Plan. + References No definition available. + Details
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Namespace Prefix: | jnj_
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Balance Type: | na
Period Type: | duration

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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Balance Type: | debit
Period Type: | duration