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Segment information (Revenues by Product) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Product sales | $ 5,569 | $ 5,453 | $ 5,574 | $ 5,199 | $ 5,663 | $ 5,516 | $ 5,474 | $ 5,239 | $ 21,795 | $ 21,892 | $ 20,944
Other revenues |  |  |  |  |  |  |  |  | 1,054 | 1,099 | 718
Total revenues |  |  |  |  |  |  |  |  | 22,849 | 22,991 | 21,662
ENBREL [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | 5,433 | 5,965 | 5,364
Neulasta [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | 4,534 | 4,648 | 4,715
Aranesp [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | 2,053 | 2,093 | 1,951
Prolia [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | 1,968 | 1,635 | 1,312
Sensipar Mimpara [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | 1,718 | 1,582 | 1,415
XGEVA [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | 1,575 | 1,529 | 1,405
EPOGEN [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | 1,096 | 1,282 | 1,856
Kyprolis [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | 835 | 692 | 512
Vectibix [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | 642 | 611 | 549
Nplate [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | 642 | 584 | 525
NEUPOGEN [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | 549 | 765 | 1,049
Repatha [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | 319 | 141 | 10
BLINCYTO [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | 175 | 115 | 77
Other [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues [Abstract] |  |  |  |  |  |  |  |  |  |  |
Product sales |  |  |  |  |  |  |  |  | $ 256 | $ 250 | $ 204

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