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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

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