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Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
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Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount, finite-lived assets | $ 18,018 | $ 18,018
Accumulated Amortization, finite-lived assets | (6,031) | (5,468)
Foreign Currency Translation Adjustment, finite-lived assets | (4) | (6)
Net Carrying Amount, finite-lived assets | 11,983 | 12,544
Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 19,265 | 19,265
Accumulated Amortization | (6,031) | (5,468)
Foreign Currency Translation Adjustment | (9) | (11)
Net Carrying Amount | 13,225 | 13,786
Indefinite-lived assets - IPR&D |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Gross Carrying Amount, indefinite-lived assets | 1,247 | 1,247
Foreign Currency Translation Adjustment, indefinite-lived assets | (5) | (5)
Net Carrying Amount, indefinite-lived assets | 1,242 | 1,242
Intangible asset - sofosbuvir |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount, finite-lived assets | 10,720 | 10,720
Accumulated Amortization, finite-lived assets | (4,603) | (4,253)
Foreign Currency Translation Adjustment, finite-lived assets | 0 | 0
Net Carrying Amount, finite-lived assets | 6,117 | 6,467
Indefinite-lived Intangible Assets [Line Items] |  |
Accumulated Amortization | (4,603) | (4,253)
Intangible asset - axicabtagene ciloleucel |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount, finite-lived assets | 6,200 | 6,200
Accumulated Amortization, finite-lived assets | (933) | (761)
Foreign Currency Translation Adjustment, finite-lived assets | 0 | 0
Net Carrying Amount, finite-lived assets | 5,267 | 5,439
Indefinite-lived Intangible Assets [Line Items] |  |
Accumulated Amortization | (933) | (761)
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount, finite-lived assets | 1,098 | 1,098
Accumulated Amortization, finite-lived assets | (495) | (454)
Foreign Currency Translation Adjustment, finite-lived assets | (4) | (6)
Net Carrying Amount, finite-lived assets | 599 | 638
Indefinite-lived Intangible Assets [Line Items] |  |
Accumulated Amortization | $ (495) | $ (454)

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