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Intangible Assets and Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets [Table Text Block] | The following table summarizes the carrying amount of our Intangible assets, net (in millions):
|  | December 31,
|  | 2017 |  | 2016
Finite-lived intangible assets |  | $ | 14,350 |  |  | $ | 8,971 |
Indefinite-lived intangible assets |  | 2,750 |  |  | — |
Total |  | $ | 17,100 |  |  | $ | 8,971 |
Schedule of Finite-Lived Intangible Assets [Table Text Block] | The following table summarizes our finite-lived intangible assets (in millions):
|  | December 31, 2017 |  | December 31, 2016
|  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Intangible asset - sofosbuvir |  | $ | 10,720 |  |  | $ | 2,855 |  |  | $ | 7,865 |  |  | $ | 10,720 |  |  | $ | 2,156 |  |  | $ | 8,564 |
Intangible asset - axicabtagene ciloleucel (DLBCL) |  | 6,200 |  |  | 72 |  |  | 6,128 |  |  | — |  |  | — |  |  | — |
Intangible asset - Ranexa |  | 688 |  |  | 566 |  |  | 122 |  |  | 688 |  |  | 467 |  |  | 221 |
Other |  | 546 |  |  | 311 |  |  | 235 |  |  | 455 |  |  | 269 |  |  | 186 |
Total |  | $ | 18,154 |  |  | $ | 3,804 |  |  | $ | 14,350 |  |  | $ | 11,863 |  |  | $ | 2,892 |  |  | $ | 8,971 |
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] | As of December 31, 2017, estimated future amortization expense associated with our finite-lived intangible assets is as follows (in millions):
Fiscal Year | Amount
2018 | $ | 1,203 |
2019 | 1,088 |
2020 | 1,064 |
2021 | 1,064 |
2022 | 1,064 |
Thereafter | 8,867 |
Total | $ | 14,350 |
Schedule of Goodwill [Table Text Block] | The following table summarizes the changes in the carrying amount of goodwill (in millions):
Balance at December 31, 2016 | $ | 1,172 |
Goodwill resulting from the acquisition of Kite | 2,987 |
Balance at December 31, 2017 | $ | 4,159 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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