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Acquisition, Equity-Method Investment and Licensing Arrangements - Equity Method Investment Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 28, 2020 | Jun. 28, 2020 | Sep. 29, 2019 | Jun. 30, 2019 | Jun. 28, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Jul. 31, 2019
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Gain on completion of Consumer Healthcare JV transaction | [1] |  | $ 0 |  | $ 0 | $ 6 | $ 0 |  |
Equity-method investments | [2] | $ 15,578 | 15,578 |  |  | 15,578 |  | $ 17,133 |
GSK Consumer Healthcare [Member] |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  |  | 32.00%
Gain on completion of Consumer Healthcare JV transaction |  |  |  | $ 8,100 |  |  |  |  |
Gain on completion of Consumer Healthcare JV transaction, after-tax |  |  |  | $ 5,400 |  |  |  |  |
Equity-method investments |  | 15,400 | 15,400 |  |  | 15,400 |  | 17,000 |
Equity method investment earnings |  |  | 129 |  |  | 140 |  |  |
Fair value of equity method investment |  |  |  |  |  |  |  |  | $ 15,700
Underlying equity in net assets |  |  |  |  |  |  |  | 11,000 | 11,200
Difference between carrying amount and underlying equity |  |  |  |  |  |  |  | $ 4,800 | $ 4,500
Decrease due to foreign currency translation |  |  |  |  |  | 1,100 |  |  |
Dividend received |  | $ 519 |  |  |  |  |  |  |
GSK [Member] | GSK Consumer Healthcare [Member] |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  |  |  |  | 68.00%
OID [Member] | GSK Consumer Healthcare [Member] |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Excess basis amortization |  |  | $ 4 |  |  | $ 48 |  |  |
Consumer Healthcare [Member] | Held-for-sale [Member] |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Pre-tax income attributable to disposal group |  |  |  |  | $ 274 |  | $ 554 |  |
Minimum [Member] | GSK Consumer Healthcare [Member] |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Excess basis amortization period |  |  |  |  |  | 6 years |  |  |
Maximum [Member] | GSK Consumer Healthcare [Member] |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Excess basis amortization period |  |  |  |  |  | 20 years |  |  |
[1] | Amounts may not add due to rounding.
[2] | Amounts may not add due to rounding.

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