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Revenues (Revenues by Product and by Geographic Area) (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) segment	Jun. 30, 2017 USD ($)
Revenue from External Customer [Line Items]
Number of operating segments | segment			1
Total revenues	$ 6,059	$ 5,810	$ 11,613	$ 11,274
Hedging gains (losses)	(20)	33	(54)	90
Product sales [Member]
Revenue from External Customer [Line Items]
Total product sales	5,679	5,574	11,022	10,773
Product sales [Member] | US [Member]
Revenue from External Customer [Line Items]
Total product sales	4,367	4,386	8,514	8,481
Product sales [Member] | ROW [Member]
Revenue from External Customer [Line Items]
Total product sales	1,312	1,188	2,508	2,292
Enbrel [Member]
Revenue from External Customer [Line Items]
Total product sales	1,302	1,466	2,407	2,647
Enbrel [Member] | US [Member]
Revenue from External Customer [Line Items]
Total product sales	1,252	1,411	2,302	2,529
Enbrel [Member] | ROW [Member]
Revenue from External Customer [Line Items]
Total product sales	50	55	105	118
Neulasta® [Member]
Revenue from External Customer [Line Items]
Total product sales	1,100	1,087	2,255	2,297
Neulasta® [Member] | US [Member]
Revenue from External Customer [Line Items]
Total product sales	948	937	1,957	1,985
Neulasta® [Member] | ROW [Member]
Revenue from External Customer [Line Items]
Total product sales	152	150	298	312
Prolia® [Member]
Revenue from External Customer [Line Items]
Total product sales	610	505	1,104	930
Prolia® [Member] | US [Member]
Revenue from External Customer [Line Items]
Total product sales	396	326	716	605
Prolia® [Member] | ROW [Member]
Revenue from External Customer [Line Items]
Total product sales	214	179	388	325
Aranesp® [Member]
Revenue from External Customer [Line Items]
Total product sales	472	535	926	1,046
Aranesp® [Member] | US [Member]
Revenue from External Customer [Line Items]
Total product sales	241	288	466	566
Aranesp® [Member] | ROW [Member]
Revenue from External Customer [Line Items]
Total product sales	231	247	460	480
Sensipar® / Mimpara® [Member]
Revenue from External Customer [Line Items]
Total product sales	420	427	917	848
Sensipar® / Mimpara® [Member] | US [Member]
Revenue from External Customer [Line Items]
Total product sales	330	342	739	679
Sensipar® / Mimpara® [Member] | ROW [Member]
Revenue from External Customer [Line Items]
Total product sales	90	85	178	169
XGEVA® [Member]
Revenue from External Customer [Line Items]
Total product sales	452	395	897	797
XGEVA® [Member] | US [Member]
Revenue from External Customer [Line Items]
Total product sales	339	292	671	590
XGEVA® [Member] | ROW [Member]
Revenue from External Customer [Line Items]
Total product sales	113	103	226	207
EPOGEN® [Member]
Revenue from External Customer [Line Items]
Total product sales	250	292	494	562
EPOGEN® [Member] | US [Member]
Revenue from External Customer [Line Items]
Total product sales	250	292	494	562
EPOGEN® [Member] | ROW [Member]
Revenue from External Customer [Line Items]
Total product sales	0	0	0	0
Other products [Member]
Revenue from External Customer [Line Items]
Total product sales	1,073	867	2,022	1,646
Other products [Member] | US [Member]
Revenue from External Customer [Line Items]
Total product sales	611	498	1,169	965
Other products [Member] | ROW [Member]
Revenue from External Customer [Line Items]
Total product sales	462	369	853	681
Other revenues [Member]
Revenue from External Customer [Line Items]
Total revenues	$ 380	$ 236	$ 591	$ 501

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