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Intangible Assets - Summary of Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
Gross Carrying Amount $ 19,953 $ 19,953
Foreign Currency Translation Adjustment (14) (11)
Intangible assets, net 13,502 13,786
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 18,706 18,706
Accumulated Amortization 6,437 6,156
Foreign Currency Translation Adjustment (7) (6)
Net Carrying Amount 12,262 12,544
Indefinite-lived assets - IPR&D    
Indefinite-lived Intangible Assets [Line Items]    
Gross Carrying Amount 1,247 1,247
Net Carrying Amount 1,240 1,242
In Process Research and Development [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Indefinite-lived Intangible Assets, Foreign Currency Translation Gain (Loss) (7) (5)
Intangible asset - sofosbuvir    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 10,720 10,720
Accumulated Amortization 4,428 4,253
Foreign Currency Translation Adjustment 0 0
Net Carrying Amount 6,292 6,467
Intangible asset - axicabtagene ciloleucel    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 6,200 6,200
Accumulated Amortization 847 761
Foreign Currency Translation Adjustment 0 0
Net Carrying Amount 5,353 5,439
Intangible asset - Ranexa    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 688 688
Accumulated Amortization 688 688
Foreign Currency Translation Adjustment 0 0
Net Carrying Amount 0 0
Other    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 1,098 1,098
Accumulated Amortization 474 454
Foreign Currency Translation Adjustment (7) (6)
Net Carrying Amount $ 617 $ 638