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Intangible Assets - Summary of Intangible Assets (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
Gross Carrying Amount $ 20,753 $ 20,751
Foreign Currency Translation Adjustment (7) (6)
Intangible assets, net 15,152 15,738
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 18,706 18,704
Accumulated Amortization 5,594 5,007
Foreign Currency Translation Adjustment (3) (3)
Net Carrying Amount 13,109 13,694
Indefinite-lived assets - In Process Research & Development    
Indefinite-lived Intangible Assets [Line Items]    
Gross Carrying Amount 2,047 2,047
Net Carrying Amount 2,043 2,044
In Process Research and Development [Member]    
Indefinite-lived Intangible Assets [Line Items]    
Indefinite-lived Intangible Assets, Foreign Currency Translation Gain (Loss) (4) (3)
Intangible asset - sofosbuvir    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 10,720 10,720
Accumulated Amortization 3,903 3,554
Foreign Currency Translation Adjustment 0 0
Net Carrying Amount 6,817 7,166
Intangible asset - axicabtagene ciloleucel (DLBCL)    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 6,200 6,200
Accumulated Amortization 588 416
Foreign Currency Translation Adjustment 0 0
Net Carrying Amount 5,612 5,784
Intangible asset - Ranexa    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 688 688
Accumulated Amortization 688 678
Foreign Currency Translation Adjustment 0 0
Net Carrying Amount 0 10
Other    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 1,098 1,096
Accumulated Amortization 415 359
Foreign Currency Translation Adjustment (3) (3)
Net Carrying Amount $ 680 $ 734