Other (Income)/Deductions - Net - Footnotes (Detail) - USD ($) $ in Millions		3 Months Ended
		Apr. 02, 2023	Apr. 03, 2022
Loss Contingencies [Line Items]
Unrealized gain (loss) on equity securities	[1]	$ (485)	$ (710)
Intangible asset impairment charge		248
IPR&D [Member]
Loss Contingencies [Line Items]
Intangible asset impairment charge	[2]	94
Other Business Activities [Member]
Loss Contingencies [Line Items]
Intangible asset impairment charge	[2]	128
Operating Segments [Member] | IPR&D [Member] | Biopharma [Member]
Loss Contingencies [Line Items]
Intangible asset impairment charge		120
BioNTech and Cerevel [Member]
Loss Contingencies [Line Items]
Unrealized gain (loss) on equity securities		(363)
BioNTech [Member]
Loss Contingencies [Line Items]
Unrealized gain (loss) on equity securities			(473)
Nimbus [Member]
Loss Contingencies [Line Items]
Dividend income		211
ViiV [Member]
Loss Contingencies [Line Items]
Dividend income		$ 92	$ 56

[1] Included in net unrealized (gains)/losses are observable price changes on equity securities without readily determinable fair values. As of April 2, 2023, there were cumulative impairments and downward adjustments of $171 million and upward adjustments of $203 million. Impairments, downward and upward adjustments were not significant in the first quarters of 2023 and 2022.

[2] Reflects intangible assets written down to fair value in 2023. Fair value was determined using the income approach, specifically the multi-period excess earnings method, also known as the discounted cash flow method. We started with a forecast of all the expected net cash flows for the asset and then applied an asset-specific discount rate to arrive at a net present value amount. Some of the more significant estimates and assumptions inherent in this approach include: the amount and timing of the projected net cash flows, which includes the expected impact of competitive, legal and/or regulatory forces on the product; the discount rate, which seeks to reflect the various risks inherent in the projected cash flows; and the tax rate, which seeks to incorporate the geographic diversity of the projected cash flows.