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Business Combinations (Intangible Assets) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]    
Finite-Lived Intangible Assets, Gross $ 38,757 $ 25,935
Finite-Lived Intangible Assets, Accumulated Amortization (6,932) (4,838)
Indefinite-lived Intangible Assets (Excluding Goodwill) 8,714 3,376
Intangible Assets, Gross (Excluding Goodwill) 47,471 29,311
Patents & trademarks [Member]    
Business Acquisition [Line Items]    
Finite-Lived Intangible Assets, Gross 48 47
Finite-Lived Intangible Assets, Accumulated Amortization (35) (34)
Collaboration [Member]    
Business Acquisition [Line Items]    
Finite-Lived Intangible Assets, Gross 5,021 4,862
Finite-Lived Intangible Assets, Accumulated Amortization (1,024) (920)
Exclusivity Assets [Member]    
Business Acquisition [Line Items]    
Finite-Lived Intangible Assets, Gross 2,541 2,386
Finite-Lived Intangible Assets, Accumulated Amortization (295) (275)
Developed Technology Rights    
Business Acquisition [Line Items]    
Finite-Lived Intangible Assets, Gross 906 890
Finite-Lived Intangible Assets, Accumulated Amortization (316) (217)
Customer Relationships [Member]    
Business Acquisition [Line Items]    
Finite-Lived Intangible Assets, Gross 30,241 17,750
Finite-Lived Intangible Assets, Accumulated Amortization $ (5,262) $ (3,392)