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Intangible Assets - Summary of Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 18,154 | $ 18,154
Accumulated Amortization | (4,405) | (3,804)
Foreign Currency Translation Adjustment | (3) |
Total | 13,746 | 14,350
Intangible asset - sofosbuvir |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 10,720 | 10,720
Accumulated Amortization | (3,205) | (2,855)
Foreign Currency Translation Adjustment | 0 |
Total | 7,515 | 7,865
Intangible asset - axicabtagene ciloleucel (DLBCL) |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 6,200 | 6,200
Accumulated Amortization | (244) | (72)
Foreign Currency Translation Adjustment | 0 |
Total | 5,956 | 6,128
Intangible asset - Ranexa |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 688 | 688
Accumulated Amortization | (622) | (566)
Foreign Currency Translation Adjustment | 0 |
Total | 66 | 122
Other |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 546 | 546
Accumulated Amortization | (334) | (311)
Foreign Currency Translation Adjustment | (3) |
Total | $ 209 | $ 235

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