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Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |
Gross Carrying Amount | $ 20,753 | $ 20,751
Foreign Currency Translation Adjustment | (14) | (6)
Intangible assets, net | 14,864 | 15,738
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 18,706 | 18,704
Accumulated Amortization | 5,875 | 5,007
Foreign Currency Translation Adjustment | (7) | (3)
Net Carrying Amount | 12,824 | 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 | 2,040 | 2,044
In Process Research and Development [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Indefinite-lived Intangible Assets, Foreign Currency Translation Gain (Loss) | (7) | (3)
Intangible asset - sofosbuvir |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 10,720 | 10,720
Accumulated Amortization | 4,078 | 3,554
Foreign Currency Translation Adjustment | 0 | 0
Net Carrying Amount | 6,642 | 7,166
Intangible asset - axicabtagene ciloleucel (DLBCL) |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 6,200 | 6,200
Accumulated Amortization | 675 | 416
Foreign Currency Translation Adjustment | 0 | 0
Net Carrying Amount | 5,525 | 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 | 434 | 359
Foreign Currency Translation Adjustment | (7) | (3)
Net Carrying Amount | $ 657 | $ 734

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