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Intangible Assets - Summary of Intangible Assets (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
Gross Carrying Amount $ 21,021 $ 20,904
Foreign Currency Translation Adjustment (1)  
Intangible assets, net 16,314 17,100
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 18,154 18,154
Accumulated Amortization 4,706 3,804
Foreign Currency Translation Adjustment (1)  
Net Carrying Amount 13,447 14,350
Indefinite-lived intangible assets - IPR&D    
Indefinite-lived Intangible Assets [Line Items]    
Gross Carrying Amount 2,867 2,750
Net Carrying Amount 2,867 2,750
Intangible asset - sofosbuvir    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 10,720 10,720
Accumulated Amortization 3,379 2,855
Foreign Currency Translation Adjustment 0  
Net Carrying Amount 7,341 7,865
Intangible asset - axicabtagene ciloleucel (DLBCL)    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 6,200 6,200
Accumulated Amortization 330 72
Foreign Currency Translation Adjustment 0  
Net Carrying Amount 5,870 6,128
Intangible asset - Ranexa    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 688 688
Accumulated Amortization 650 566
Foreign Currency Translation Adjustment 0  
Net Carrying Amount 38 122
Other    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 546 546
Accumulated Amortization 347 311
Foreign Currency Translation Adjustment (1)  
Net Carrying Amount $ 198 $ 235