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Segment Reporting - Sales of Company's Products (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Segment Reporting Information [Line Items]    
Sales $ 10,037 $ 9,434
Proceeds from sale of marketing rights 21 50
Operating Segments    
Segment Reporting Information [Line Items]    
Sales 10,068 9,218
Operating Segments | Total Pharmaceutical segment sales    
Segment Reporting Information [Line Items]    
Sales 8,919 8,185
Operating Segments | Total Pharmaceutical segment sales | Keytruda    
Segment Reporting Information [Line Items]    
Sales 1,464 584
Operating Segments | Total Pharmaceutical segment sales | Emend    
Segment Reporting Information [Line Items]    
Sales 125 133
Operating Segments | Total Pharmaceutical segment sales | Temodar    
Segment Reporting Information [Line Items]    
Sales 57 66
Operating Segments | Total Pharmaceutical segment sales | Alliance revenue - Lynparza    
Segment Reporting Information [Line Items]    
Sales 33 0
Operating Segments | Total Pharmaceutical segment sales | Gardasil/Gardasil 9    
Segment Reporting Information [Line Items]    
Sales 660 532
Operating Segments | Total Pharmaceutical segment sales | ProQuad/M-M-R II/Varivax    
Segment Reporting Information [Line Items]    
Sales 392 355
Operating Segments | Total Pharmaceutical segment sales | RotaTeq    
Segment Reporting Information [Line Items]    
Sales 193 224
Operating Segments | Total Pharmaceutical segment sales | Pneumovax 23    
Segment Reporting Information [Line Items]    
Sales 179 163
Operating Segments | Total Pharmaceutical segment sales | Zostavax    
Segment Reporting Information [Line Items]    
Sales 65 154
Operating Segments | Total Pharmaceutical segment sales | Bridion    
Segment Reporting Information [Line Items]    
Sales 204 148
Operating Segments | Total Pharmaceutical segment sales | Noxafil    
Segment Reporting Information [Line Items]    
Sales 176 141
Operating Segments | Total Pharmaceutical segment sales | Invanz    
Segment Reporting Information [Line Items]    
Sales 151 136
Operating Segments | Total Pharmaceutical segment sales | Cubicin    
Segment Reporting Information [Line Items]    
Sales 98 96
Operating Segments | Total Pharmaceutical segment sales | Cancidas    
Segment Reporting Information [Line Items]    
Sales 91 121
Operating Segments | Total Pharmaceutical segment sales | Primaxin    
Segment Reporting Information [Line Items]    
Sales 72 62
Operating Segments | Total Pharmaceutical segment sales | Simponi    
Segment Reporting Information [Line Items]    
Sales 231 184
Operating Segments | Total Pharmaceutical segment sales | Remicade    
Segment Reporting Information [Line Items]    
Sales 167 229
Operating Segments | Total Pharmaceutical segment sales | Belsomra    
Segment Reporting Information [Line Items]    
Sales 54 42
Operating Segments | Total Pharmaceutical segment sales | Isentress/Isentress HD    
Segment Reporting Information [Line Items]    
Sales 281 305
Operating Segments | Total Pharmaceutical segment sales | Zepatier    
Segment Reporting Information [Line Items]    
Sales 131 378
Operating Segments | Total Pharmaceutical segment sales | Zetia    
Segment Reporting Information [Line Items]    
Sales 305 334
Operating Segments | Total Pharmaceutical segment sales | Vytorin    
Segment Reporting Information [Line Items]    
Sales 167 241
Operating Segments | Total Pharmaceutical segment sales | Atozet    
Segment Reporting Information [Line Items]    
Sales 73 49
Operating Segments | Total Pharmaceutical segment sales | Adempas    
Segment Reporting Information [Line Items]    
Sales 68 84
Operating Segments | Total Pharmaceutical segment sales | Januvia    
Segment Reporting Information [Line Items]    
Sales 880 839
Operating Segments | Total Pharmaceutical segment sales | Janumet    
Segment Reporting Information [Line Items]    
Sales 544 496
Operating Segments | Total Pharmaceutical segment sales | NuvaRing    
Segment Reporting Information [Line Items]    
Sales 216 160
Operating Segments | Total Pharmaceutical segment sales | Implanon/Nexplanon    
Segment Reporting Information [Line Items]    
Sales 174 170
Operating Segments | Total Pharmaceutical segment sales | Singulair    
Segment Reporting Information [Line Items]    
Sales 175 186
Operating Segments | Total Pharmaceutical segment sales | Nasonex    
Segment Reporting Information [Line Items]    
Sales 122 139
Operating Segments | Total Pharmaceutical segment sales | Cozaar/Hyzaar    
Segment Reporting Information [Line Items]    
Sales 120 112
Operating Segments | Total Pharmaceutical segment sales | Arcoxia    
Segment Reporting Information [Line Items]    
Sales 83 103
Operating Segments | Total Pharmaceutical segment sales | Follistim AQ    
Segment Reporting Information [Line Items]    
Sales 67 81
Operating Segments | Total Pharmaceutical segment sales | Dulera    
Segment Reporting Information [Line Items]    
Sales 57 82
Operating Segments | Total Pharmaceutical segment sales | Fosamax    
Segment Reporting Information [Line Items]    
Sales 55 61
Operating Segments | Total Pharmaceutical segment sales | Other Pharmaceutical    
Segment Reporting Information [Line Items]    
Sales 989 995
Operating Segments | Total Animal Health segment sales    
Segment Reporting Information [Line Items]    
Sales 1,065 939
Operating Segments | Total Animal Health segment sales | Livestock    
Segment Reporting Information [Line Items]    
Sales 652 578
Operating Segments | Total Animal Health segment sales | Companion Animals    
Segment Reporting Information [Line Items]    
Sales 413 361
Operating Segments | Other segment sales    
Segment Reporting Information [Line Items]    
Sales 84 94
Other    
Segment Reporting Information [Line Items]    
Sales (31) 216
United States    
Segment Reporting Information [Line Items]    
Sales 4,133 4,195
United States | Operating Segments    
Segment Reporting Information [Line Items]    
Sales 4,107 4,138
United States | Operating Segments | Total Pharmaceutical segment sales    
Segment Reporting Information [Line Items]    
Sales 3,716 3,761
United States | Operating Segments | Total Pharmaceutical segment sales | Keytruda    
Segment Reporting Information [Line Items]    
Sales 838 361
United States | Operating Segments | Total Pharmaceutical segment sales | Emend    
Segment Reporting Information [Line Items]    
Sales 79 86
United States | Operating Segments | Total Pharmaceutical segment sales | Temodar    
Segment Reporting Information [Line Items]    
Sales 1 1
United States | Operating Segments | Total Pharmaceutical segment sales | Alliance revenue - Lynparza    
Segment Reporting Information [Line Items]    
Sales 24 0
United States | Operating Segments | Total Pharmaceutical segment sales | Gardasil/Gardasil 9    
Segment Reporting Information [Line Items]    
Sales 380 398
United States | Operating Segments | Total Pharmaceutical segment sales | ProQuad/M-M-R II/Varivax    
Segment Reporting Information [Line Items]    
Sales 312 298
United States | Operating Segments | Total Pharmaceutical segment sales | RotaTeq    
Segment Reporting Information [Line Items]    
Sales 151 178
United States | Operating Segments | Total Pharmaceutical segment sales | Pneumovax 23    
Segment Reporting Information [Line Items]    
Sales 112 114
United States | Operating Segments | Total Pharmaceutical segment sales | Zostavax    
Segment Reporting Information [Line Items]    
Sales 16 109
United States | Operating Segments | Total Pharmaceutical segment sales | Bridion    
Segment Reporting Information [Line Items]    
Sales 80 45
United States | Operating Segments | Total Pharmaceutical segment sales | Noxafil    
Segment Reporting Information [Line Items]    
Sales 81 65
United States | Operating Segments | Total Pharmaceutical segment sales | Invanz    
Segment Reporting Information [Line Items]    
Sales 91 82
United States | Operating Segments | Total Pharmaceutical segment sales | Cubicin    
Segment Reporting Information [Line Items]    
Sales 47 54
United States | Operating Segments | Total Pharmaceutical segment sales | Cancidas    
Segment Reporting Information [Line Items]    
Sales 3 5
United States | Operating Segments | Total Pharmaceutical segment sales | Primaxin    
Segment Reporting Information [Line Items]    
Sales 5 0
United States | Operating Segments | Total Pharmaceutical segment sales | Simponi    
Segment Reporting Information [Line Items]    
Sales 0 0
United States | Operating Segments | Total Pharmaceutical segment sales | Remicade    
Segment Reporting Information [Line Items]    
Sales 0 0
United States | Operating Segments | Total Pharmaceutical segment sales | Belsomra    
Segment Reporting Information [Line Items]    
Sales 23 20
United States | Operating Segments | Total Pharmaceutical segment sales | Isentress/Isentress HD    
Segment Reporting Information [Line Items]    
Sales 128 143
United States | Operating Segments | Total Pharmaceutical segment sales | Zepatier    
Segment Reporting Information [Line Items]    
Sales 0 200
United States | Operating Segments | Total Pharmaceutical segment sales | Zetia    
Segment Reporting Information [Line Items]    
Sales 17 111
United States | Operating Segments | Total Pharmaceutical segment sales | Vytorin    
Segment Reporting Information [Line Items]    
Sales 8 90
United States | Operating Segments | Total Pharmaceutical segment sales | Atozet    
Segment Reporting Information [Line Items]    
Sales 0 0
United States | Operating Segments | Total Pharmaceutical segment sales | Adempas    
Segment Reporting Information [Line Items]    
Sales 0 0
United States | Operating Segments | Total Pharmaceutical segment sales | Januvia    
Segment Reporting Information [Line Items]    
Sales 465 507
United States | Operating Segments | Total Pharmaceutical segment sales | Janumet    
Segment Reporting Information [Line Items]    
Sales 192 195
United States | Operating Segments | Total Pharmaceutical segment sales | NuvaRing    
Segment Reporting Information [Line Items]    
Sales 171 113
United States | Operating Segments | Total Pharmaceutical segment sales | Implanon/Nexplanon    
Segment Reporting Information [Line Items]    
Sales 128 132
United States | Operating Segments | Total Pharmaceutical segment sales | Singulair    
Segment Reporting Information [Line Items]    
Sales 6 6
United States | Operating Segments | Total Pharmaceutical segment sales | Nasonex    
Segment Reporting Information [Line Items]    
Sales 1 18
United States | Operating Segments | Total Pharmaceutical segment sales | Cozaar/Hyzaar    
Segment Reporting Information [Line Items]    
Sales 7 3
United States | Operating Segments | Total Pharmaceutical segment sales | Arcoxia    
Segment Reporting Information [Line Items]    
Sales 0 0
United States | Operating Segments | Total Pharmaceutical segment sales | Follistim AQ    
Segment Reporting Information [Line Items]    
Sales 29 42
United States | Operating Segments | Total Pharmaceutical segment sales | Dulera    
Segment Reporting Information [Line Items]    
Sales 50 75
United States | Operating Segments | Total Pharmaceutical segment sales | Fosamax    
Segment Reporting Information [Line Items]    
Sales (2) 1
United States | Operating Segments | Total Pharmaceutical segment sales | Other Pharmaceutical    
Segment Reporting Information [Line Items]    
Sales 273 309
United States | Operating Segments | Total Animal Health segment sales    
Segment Reporting Information [Line Items]    
Sales 307 283
United States | Operating Segments | Total Animal Health segment sales | Livestock    
Segment Reporting Information [Line Items]    
Sales 124 119
United States | Operating Segments | Total Animal Health segment sales | Companion Animals    
Segment Reporting Information [Line Items]    
Sales 183 164
United States | Operating Segments | Other segment sales    
Segment Reporting Information [Line Items]    
Sales 84 94
United States | Other    
Segment Reporting Information [Line Items]    
Sales 26 57
International    
Segment Reporting Information [Line Items]    
Sales 5,904 5,239
International | Operating Segments    
Segment Reporting Information [Line Items]    
Sales 5,960 5,080
International | Operating Segments | Total Pharmaceutical segment sales    
Segment Reporting Information [Line Items]    
Sales 5,202 4,424
International | Operating Segments | Total Pharmaceutical segment sales | Keytruda    
Segment Reporting Information [Line Items]    
Sales 626 223
International | Operating Segments | Total Pharmaceutical segment sales | Emend    
Segment Reporting Information [Line Items]    
Sales 46 47
International | Operating Segments | Total Pharmaceutical segment sales | Temodar    
Segment Reporting Information [Line Items]    
Sales 56 65
International | Operating Segments | Total Pharmaceutical segment sales | Alliance revenue - Lynparza    
Segment Reporting Information [Line Items]    
Sales 9 0
International | Operating Segments | Total Pharmaceutical segment sales | Gardasil/Gardasil 9    
Segment Reporting Information [Line Items]    
Sales 280 134
International | Operating Segments | Total Pharmaceutical segment sales | ProQuad/M-M-R II/Varivax    
Segment Reporting Information [Line Items]    
Sales 80 57
International | Operating Segments | Total Pharmaceutical segment sales | RotaTeq    
Segment Reporting Information [Line Items]    
Sales 42 45
International | Operating Segments | Total Pharmaceutical segment sales | Pneumovax 23    
Segment Reporting Information [Line Items]    
Sales 66 49
International | Operating Segments | Total Pharmaceutical segment sales | Zostavax    
Segment Reporting Information [Line Items]    
Sales 48 45
International | Operating Segments | Total Pharmaceutical segment sales | Bridion    
Segment Reporting Information [Line Items]    
Sales 124 102
International | Operating Segments | Total Pharmaceutical segment sales | Noxafil    
Segment Reporting Information [Line Items]    
Sales 94 76
International | Operating Segments | Total Pharmaceutical segment sales | Invanz    
Segment Reporting Information [Line Items]    
Sales 60 54
International | Operating Segments | Total Pharmaceutical segment sales | Cubicin    
Segment Reporting Information [Line Items]    
Sales 51 41
International | Operating Segments | Total Pharmaceutical segment sales | Cancidas    
Segment Reporting Information [Line Items]    
Sales 88 116
International | Operating Segments | Total Pharmaceutical segment sales | Primaxin    
Segment Reporting Information [Line Items]    
Sales 67 62
International | Operating Segments | Total Pharmaceutical segment sales | Simponi    
Segment Reporting Information [Line Items]    
Sales 231 184
International | Operating Segments | Total Pharmaceutical segment sales | Remicade    
Segment Reporting Information [Line Items]    
Sales 167 229
International | Operating Segments | Total Pharmaceutical segment sales | Belsomra    
Segment Reporting Information [Line Items]    
Sales 31 21
International | Operating Segments | Total Pharmaceutical segment sales | Isentress/Isentress HD    
Segment Reporting Information [Line Items]    
Sales 152 162
International | Operating Segments | Total Pharmaceutical segment sales | Zepatier    
Segment Reporting Information [Line Items]    
Sales 131 178
International | Operating Segments | Total Pharmaceutical segment sales | Zetia    
Segment Reporting Information [Line Items]    
Sales 287 222
International | Operating Segments | Total Pharmaceutical segment sales | Vytorin    
Segment Reporting Information [Line Items]    
Sales 158 151
International | Operating Segments | Total Pharmaceutical segment sales | Atozet    
Segment Reporting Information [Line Items]    
Sales 73 49
International | Operating Segments | Total Pharmaceutical segment sales | Adempas    
Segment Reporting Information [Line Items]    
Sales 68 84
International | Operating Segments | Total Pharmaceutical segment sales | Januvia    
Segment Reporting Information [Line Items]    
Sales 416 332
International | Operating Segments | Total Pharmaceutical segment sales | Janumet    
Segment Reporting Information [Line Items]    
Sales 352 302
International | Operating Segments | Total Pharmaceutical segment sales | NuvaRing    
Segment Reporting Information [Line Items]    
Sales 46 47
International | Operating Segments | Total Pharmaceutical segment sales | Implanon/Nexplanon    
Segment Reporting Information [Line Items]    
Sales 46 39
International | Operating Segments | Total Pharmaceutical segment sales | Singulair    
Segment Reporting Information [Line Items]    
Sales 170 180
International | Operating Segments | Total Pharmaceutical segment sales | Nasonex    
Segment Reporting Information [Line Items]    
Sales 121 121
International | Operating Segments | Total Pharmaceutical segment sales | Cozaar/Hyzaar    
Segment Reporting Information [Line Items]    
Sales 113 109
International | Operating Segments | Total Pharmaceutical segment sales | Arcoxia    
Segment Reporting Information [Line Items]    
Sales 83 103
International | Operating Segments | Total Pharmaceutical segment sales | Follistim AQ    
Segment Reporting Information [Line Items]    
Sales 39 40
International | Operating Segments | Total Pharmaceutical segment sales | Dulera    
Segment Reporting Information [Line Items]    
Sales 7 7
International | Operating Segments | Total Pharmaceutical segment sales | Fosamax    
Segment Reporting Information [Line Items]    
Sales 57 60
International | Operating Segments | Total Pharmaceutical segment sales | Other Pharmaceutical    
Segment Reporting Information [Line Items]    
Sales 717 688
International | Operating Segments | Total Animal Health segment sales    
Segment Reporting Information [Line Items]    
Sales 758 656
International | Operating Segments | Total Animal Health segment sales | Livestock    
Segment Reporting Information [Line Items]    
Sales 529 459
International | Operating Segments | Total Animal Health segment sales | Companion Animals    
Segment Reporting Information [Line Items]    
Sales 229 197
International | Operating Segments | Other segment sales    
Segment Reporting Information [Line Items]    
Sales 0 0
International | Other    
Segment Reporting Information [Line Items]    
Sales $ (56) $ 159