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Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Intangible Assets, Net (Excluding Goodwill) [Abstract] |  |
Gross Carrying Amount | $ 19,953 | $ 20,751
Foreign Currency Translation Adjustment | (11) | (6)
Intangible assets, net | 13,786 | 15,738
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 18,706 | 18,704
Accumulated Amortization | 6,156 | 5,007
Foreign Currency Translation Adjustment | (6) | (3)
Net Carrying Amount | 12,544 | 13,694
Indefinite-lived intangible assets - IPR&D |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) | 1,247 | 2,047
Net Carrying Amount | 1,242 | 2,044
In Process Research and Development [Member] |  |
Indefinite-lived Intangible Assets [Line Items] |  |
Indefinite-lived Intangible Assets, Foreign Currency Translation Gain (Loss) | (5) | (3)
Intangible asset - sofosbuvir |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 10,720 | 10,720
Accumulated Amortization | 4,253 | 3,554
Foreign Currency Translation Adjustment | 0 | 0
Net Carrying Amount | 6,467 | 7,166
Intangible asset - axicabtagene ciloleucel (DLBCL) |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 6,200 | 6,200
Accumulated Amortization | 761 | 416
Foreign Currency Translation Adjustment | 0 | 0
Net Carrying Amount | 5,439 | 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 | 454 | 359
Foreign Currency Translation Adjustment | (6) | (3)
Net Carrying Amount | $ 638 | $ 734

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