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Financial Instruments - Total Short-Term and Long-Term Investments and Equity Method Investments - Footnotes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 28, 2020 | Jun. 28, 2020 | Jun. 30, 2019
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Proceeds from issuance of long-term debt | [1],[2] |  | $ 16,606 | $ 4,942
Subsidiaries [Member] | Upjohn Inc [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Proceeds from issuance of long-term debt |  | $ 11,400 | $ 11,400 |
[1] | Amounts may not add due to rounding.
[2] | Includes $11.4 billion of proceeds from the Upjohn long-term debt issuances in the second quarter of 2020, which are included in Restricted short-term investments in the condensed consolidated balance sheet. For additional information, see Notes 7A. Financial Instruments: Fair Value Measurements and Financial Instruments: 7D. Long-Term Debt).

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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
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