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Revenues (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2018 USD ($) segment	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Revenue from Contract with Customer [Abstract]
Number of operating segments | segment									1
Revenue from External Customer [Line Items]
Total revenues									$ 23,747	$ 22,849	$ 22,991
US [Member]
Revenue from External Customer [Line Items]
Total revenues									18,358	18,029	18,326
ROW [Member]
Revenue from External Customer [Line Items]
Total revenues									5,389	4,820	4,665
Product sales [Member]
Revenue from External Customer [Line Items]
Total product sales	$ 6,001	$ 5,510	$ 5,679	$ 5,343	$ 5,569	$ 5,453	$ 5,574	$ 5,199	22,533	21,795	21,892
Hedging gains											308
Product sales [Member] | US [Member]
Revenue from External Customer [Line Items]
Total product sales									17,429	17,131	17,325
Product sales [Member] | ROW [Member]
Revenue from External Customer [Line Items]
Total product sales									5,104	4,664	4,567
Enbrel® (etanercept) [Member]
Revenue from External Customer [Line Items]
Total product sales									5,014	5,433	5,965
Enbrel® (etanercept) [Member] | US [Member]
Revenue from External Customer [Line Items]
Total product sales									4,807	5,206	5,719
Enbrel® (etanercept) [Member] | ROW [Member]
Revenue from External Customer [Line Items]
Total product sales									207	227	246
Neulasta® (pegfilgrastim) [Member]
Revenue from External Customer [Line Items]
Total product sales									4,475	4,534	4,648
Neulasta® (pegfilgrastim) [Member] | US [Member]
Revenue from External Customer [Line Items]
Total product sales									3,866	3,931	3,925
Neulasta® (pegfilgrastim) [Member] | ROW [Member]
Revenue from External Customer [Line Items]
Total product sales									609	603	723
Prolia® (denosumab) [Member]
Revenue from External Customer [Line Items]
Total product sales									2,291	1,968	1,635
Prolia® (denosumab) [Member] | US [Member]
Revenue from External Customer [Line Items]
Total product sales									1,500	1,272	1,049
Prolia® (denosumab) [Member] | ROW [Member]
Revenue from External Customer [Line Items]
Total product sales									791	696	586
Aranesp® (darbepoetin alfa) [Member]
Revenue from External Customer [Line Items]
Total product sales									1,877	2,053	2,093
Aranesp® (darbepoetin alfa) [Member] | US [Member]
Revenue from External Customer [Line Items]
Total product sales									942	1,114	1,082
Aranesp® (darbepoetin alfa) [Member] | ROW [Member]
Revenue from External Customer [Line Items]
Total product sales									935	939	1,011
XGEVA® (denosumab) [Member]
Revenue from External Customer [Line Items]
Total product sales									1,786	1,575	1,529
XGEVA® (denosumab) [Member] | US [Member]
Revenue from External Customer [Line Items]
Total product sales									1,338	1,157	1,115
XGEVA® (denosumab) [Member] | ROW [Member]
Revenue from External Customer [Line Items]
Total product sales									448	418	414
Sensipar® / Mimpara® (cinacalcet) [Member]
Revenue from External Customer [Line Items]
Total product sales									1,774	1,718	1,582
Sensipar® / Mimpara® (cinacalcet) [Member] | US [Member]
Revenue from External Customer [Line Items]
Total product sales									1,436	1,374	1,240
Sensipar® / Mimpara® (cinacalcet) [Member] | ROW [Member]
Revenue from External Customer [Line Items]
Total product sales									338	344	342
EPOGEN® (epoetin alfa) [Member]
Revenue from External Customer [Line Items]
Total product sales									1,010	1,096	1,282
EPOGEN® (epoetin alfa) [Member] | US [Member]
Revenue from External Customer [Line Items]
Total product sales									1,010	1,096	1,282
EPOGEN® (epoetin alfa) [Member] | ROW [Member]
Revenue from External Customer [Line Items]
Total product sales									0	0	0
Other products [Member]
Revenue from External Customer [Line Items]
Total product sales									4,306	3,418	3,158
Other products [Member] | US [Member]
Revenue from External Customer [Line Items]
Total product sales									2,530	1,981	1,913
Other products [Member] | ROW [Member]
Revenue from External Customer [Line Items]
Total product sales									1,776	1,437	1,245
Other revenues [Member]
Revenue from External Customer [Line Items]
Total revenues									1,214	1,054	1,099
Other revenues [Member] | US [Member]
Revenue from External Customer [Line Items]
Total revenues									929	898	1,001
Other revenues [Member] | ROW [Member]
Revenue from External Customer [Line Items]
Total revenues									$ 285	$ 156	$ 98

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