Identifiable Intangible Assets and Goodwill - Footnotes (Details) $ in Millions	9 Months Ended
	Sep. 29, 2024 USD ($)
Finite-Lived Intangible Assets [Line Items]
Intangible asset impairment charge	$ 349
Amortization expense for finite-lived intangible assets	3,900
Seagen [Member]
Finite-Lived Intangible Assets [Line Items]
Intangibles, measurement period adjustments	385
In-process research and development, measurement period adjustments	250
Identifiable intangible assets, net of adjustments	625
IPR&D [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset impairment charge	240	[1]
talazoparib (Talzenna) [Member] | IPR&D [Member]
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets, period increase (decrease)	(727)
Depo-Medrol [Member] | Brands [Member]
Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets, period increase (decrease)	(827)
Developed technology rights [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible asset impairment charge	109	[1]
Developed technology rights [Member] | talazoparib (Talzenna) [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, period increase	727
Brands [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, period increase	$ 827

[1] Reflects intangible assets written down to fair value in 2024. 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.