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Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 18,154 | $ 11,863
Accumulated Amortization | 3,804 | 2,892
Total | 14,350 | 8,971
Intangible Asset - Sofosbuvir [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 10,720 | 10,720
Accumulated Amortization | 2,855 | 2,156
Total | 7,865 | 8,564
axicabtagene ciloleucel (DLBCL) [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 6,200 | 0
Accumulated Amortization | 72 | 0
Total | 6,128 | 0
Intangible Asset - Ranexa [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 688 | 688
Accumulated Amortization | 566 | 467
Total | 122 | 221
Other Intangible Assets [Member] |  |
Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 546 | 455
Accumulated Amortization | 311 | 269
Total | $ 235 | $ 186

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