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Revenues (Revenues by Product and by Geographic Area) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) segment	Sep. 30, 2017 USD ($)
Revenue from Contract with Customer [Abstract]
Number of operating segments | segment			1
Revenue from External Customer [Line Items]
Total revenues	$ 5,904	$ 5,773	$ 17,517	$ 17,047
Product sales [Member]
Revenue from External Customer [Line Items]
Total product sales	5,510	5,453	16,532	16,226
Product sales [Member] | US [Member]
Revenue from External Customer [Line Items]
Total product sales	4,260	4,297	12,774	12,778
Product sales [Member] | ROW [Member]
Revenue from External Customer [Line Items]
Total product sales	1,250	1,156	3,758	3,448
Enbrel [Member]
Revenue from External Customer [Line Items]
Total product sales	1,292	1,363	3,699	4,010
Enbrel [Member] | US [Member]
Revenue from External Customer [Line Items]
Total product sales	1,242	1,309	3,544	3,838
Enbrel [Member] | ROW [Member]
Revenue from External Customer [Line Items]
Total product sales	50	54	155	172
Neulasta® [Member]
Revenue from External Customer [Line Items]
Total product sales	1,051	1,123	3,306	3,420
Neulasta® [Member] | US [Member]
Revenue from External Customer [Line Items]
Total product sales	897	977	2,854	2,962
Neulasta® [Member] | ROW [Member]
Revenue from External Customer [Line Items]
Total product sales	154	146	452	458
Prolia® [Member]
Revenue from External Customer [Line Items]
Total product sales	532	464	1,636	1,394
Prolia® [Member] | US [Member]
Revenue from External Customer [Line Items]
Total product sales	354	298	1,070	903
Prolia® [Member] | ROW [Member]
Revenue from External Customer [Line Items]
Total product sales	178	166	566	491
Aranesp® [Member]
Revenue from External Customer [Line Items]
Total product sales	477	516	1,403	1,562
Aranesp® [Member] | US [Member]
Revenue from External Customer [Line Items]
Total product sales	248	285	714	851
Aranesp® [Member] | ROW [Member]
Revenue from External Customer [Line Items]
Total product sales	229	231	689	711
XGEVA® [Member]
Revenue from External Customer [Line Items]
Total product sales	433	387	1,330	1,184
XGEVA® [Member] | US [Member]
Revenue from External Customer [Line Items]
Total product sales	323	282	994	872
XGEVA® [Member] | ROW [Member]
Revenue from External Customer [Line Items]
Total product sales	110	105	336	312
Sensipar® / Mimpara® [Member]
Revenue from External Customer [Line Items]
Total product sales	409	457	1,326	1,305
Sensipar® / Mimpara® [Member] | US [Member]
Revenue from External Customer [Line Items]
Total product sales	330	373	1,069	1,052
Sensipar® / Mimpara® [Member] | ROW [Member]
Revenue from External Customer [Line Items]
Total product sales	79	84	257	253
EPOGEN® [Member]
Revenue from External Customer [Line Items]
Total product sales	252	264	746	826
EPOGEN® [Member] | US [Member]
Revenue from External Customer [Line Items]
Total product sales	252	264	746	826
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	1,064	879	3,086	2,525
Other products [Member] | US [Member]
Revenue from External Customer [Line Items]
Total product sales	614	509	1,783	1,474
Other products [Member] | ROW [Member]
Revenue from External Customer [Line Items]
Total product sales	450	370	1,303	1,051
Other revenues [Member]
Revenue from External Customer [Line Items]
Total revenues	$ 394	$ 320	$ 985	$ 821

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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