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Discontinued Operations and Equity-Method Investment - Equity Method Investment Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 04, 2021	Mar. 29, 2020	Dec. 31, 2020	Jul. 31, 2019
Schedule of Equity Method Investments [Line Items]
Equity-method investments	$ 16,532		$ 16,856
Consumer Healthcare JV [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage				32.00%
Equity-method investments	16,300		$ 16,700
Decrease due to foreign currency translation	126
Dividend received	274
Equity method investment earnings	$ 71	$ 11
GSK [Member] | Consumer Healthcare JV [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage				68.00%

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