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Identifiable Intangible Assets - Finite-lived and Indefinite-lived Intangible Assets (Detail) - USD ($)
$ in Millions
 3 Months Ended
Apr. 04, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross carrying amount $ 77,284 $ 76,759
Finite-lived intangible assets, accumulated amortization [1] (53,845) (52,862)
Finite-lived intangible assets, net 23,439 23,896
Indefinite-lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets 4,535 4,575
Intangible assets, gross carrying amount [1] 81,819 81,334
Finite-lived intangible assets, accumulated amortization [1] (53,845) (52,862)
Identifiable Intangible Assets, less Accumulated Amortization [1] 27,974 28,471
Brands [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets 827 827
IPR&D [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets 3,135 3,175
License Agreements and Other [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets 573 573
Developed technology rights [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross carrying amount [2] 74,056 73,545
Finite-lived intangible assets, accumulated amortization [2] (51,840) (50,902)
Finite-lived intangible assets, net [2] 22,217 22,643
Indefinite-lived Intangible Assets [Line Items]    
Finite-lived intangible assets, accumulated amortization [2] (51,840) (50,902)
Developed technology rights [Member] | BioNTech [Member] | BNT162b2 alliance revenues and direct sales [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, period increase 300  
Brands [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross carrying amount 922 922
Finite-lived intangible assets, accumulated amortization (782) (774)
Finite-lived intangible assets, net 140 148
Indefinite-lived Intangible Assets [Line Items]    
Finite-lived intangible assets, accumulated amortization (782) (774)
License Agreements and Other [Member]    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross carrying amount 2,305 2,292
Finite-lived intangible assets, accumulated amortization (1,223) (1,186)
Finite-lived intangible assets, net 1,082 1,106
Indefinite-lived Intangible Assets [Line Items]    
Finite-lived intangible assets, accumulated amortization $ (1,223) $ (1,186)
[1] The decrease is primarily due to amortization, partially offset by the capitalization of the BNT162b2 milestone payments described above.
[2] The increase in the gross carrying amount primarily reflects $300 million of capitalized BNT162b2 sales milestones due to BioNTech.