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Segment Reporting - Sales of Company's Products (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Segment Reporting Information [Line Items]    
Sales $ 12,057 $ 10,816
Proceeds from Sale of Intangible Assets 75 15
Operating Segments    
Segment Reporting Information [Line Items]    
Sales 11,892 10,727
Other    
Segment Reporting Information [Line Items]    
Sales 165 89
United States    
Segment Reporting Information [Line Items]    
Sales 5,137 4,555
United States | Operating Segments    
Segment Reporting Information [Line Items]    
Sales 5,121 4,548
United States | Other    
Segment Reporting Information [Line Items]    
Sales 16 7
International    
Segment Reporting Information [Line Items]    
Sales 6,920 6,261
International | Operating Segments    
Segment Reporting Information [Line Items]    
Sales 6,771 6,179
International | Other    
Segment Reporting Information [Line Items]    
Sales 149 82
Total Pharmaceutical segment sales | Operating Segments    
Segment Reporting Information [Line Items]    
Sales 10,655 9,663
Total Pharmaceutical segment sales | Operating Segments | Keytruda    
Segment Reporting Information [Line Items]    
Sales 3,284 2,269
Total Pharmaceutical segment sales | Operating Segments | Alliance revenue - Lynparza (1)    
Segment Reporting Information [Line Items]    
Sales 145 79
Total Pharmaceutical segment sales | Operating Segments | Alliance revenue - Lenvima (1)    
Segment Reporting Information [Line Items]    
Sales 128 74
Total Pharmaceutical segment sales | Operating Segments | Emend    
Segment Reporting Information [Line Items]    
Sales 43 117
Total Pharmaceutical segment sales | Operating Segments | Gardasil/Gardasil 9    
Segment Reporting Information [Line Items]    
Sales 1,097 838
Total Pharmaceutical segment sales | Operating Segments | ProQuad/M-M-R II/Varivax    
Segment Reporting Information [Line Items]    
Sales 435 496
Total Pharmaceutical segment sales | Operating Segments | Pneumovax 23    
Segment Reporting Information [Line Items]    
Sales 256 185
Total Pharmaceutical segment sales | Operating Segments | RotaTeq    
Segment Reporting Information [Line Items]    
Sales 222 211
Total Pharmaceutical segment sales | Operating Segments | Vaqta    
Segment Reporting Information [Line Items]    
Sales 60 47
Total Pharmaceutical segment sales | Operating Segments | Bridion    
Segment Reporting Information [Line Items]    
Sales 299 255
Total Pharmaceutical segment sales | Operating Segments | Noxafil    
Segment Reporting Information [Line Items]    
Sales 94 190
Total Pharmaceutical segment sales | Operating Segments | Invanz    
Segment Reporting Information [Line Items]    
Sales 64 72
Total Pharmaceutical segment sales | Operating Segments | Prevymis    
Segment Reporting Information [Line Items]    
Sales 60 32
Total Pharmaceutical segment sales | Operating Segments | Cancidas    
Segment Reporting Information [Line Items]    
Sales 55 61
Total Pharmaceutical segment sales | Operating Segments | Primaxin    
Segment Reporting Information [Line Items]    
Sales 51 59
Total Pharmaceutical segment sales | Operating Segments | Cubicin    
Segment Reporting Information [Line Items]    
Sales 46 88
Total Pharmaceutical segment sales | Operating Segments | Zerbaxa    
Segment Reporting Information [Line Items]    
Sales 37 26
Total Pharmaceutical segment sales | Operating Segments | Simponi    
Segment Reporting Information [Line Items]    
Sales 215 208
Total Pharmaceutical segment sales | Operating Segments | Remicade    
Segment Reporting Information [Line Items]    
Sales 88 123
Total Pharmaceutical segment sales | Operating Segments | Belsomra    
Segment Reporting Information [Line Items]    
Sales 79 67
Total Pharmaceutical segment sales | Operating Segments | Isentress/Isentress HD    
Segment Reporting Information [Line Items]    
Sales 245 255
Total Pharmaceutical segment sales | Operating Segments | Zepatier    
Segment Reporting Information [Line Items]    
Sales 55 114
Total Pharmaceutical segment sales | Operating Segments | Zetia    
Segment Reporting Information [Line Items]    
Sales 145 140
Total Pharmaceutical segment sales | Operating Segments | Vytorin    
Segment Reporting Information [Line Items]    
Sales 53 97
Total Pharmaceutical segment sales | Operating Segments | Atozet    
Segment Reporting Information [Line Items]    
Sales 122 94
Total Pharmaceutical segment sales | Operating Segments | Adempas    
Segment Reporting Information [Line Items]    
Sales 56 48
Total Pharmaceutical segment sales | Operating Segments | Alliance revenue - Adempas (2)    
Segment Reporting Information [Line Items]    
Sales 53 42
Total Pharmaceutical segment sales | Operating Segments | Januvia    
Segment Reporting Information [Line Items]    
Sales 774 824
Total Pharmaceutical segment sales | Operating Segments | Janumet    
Segment Reporting Information [Line Items]    
Sales 503 530
Total Pharmaceutical segment sales | Operating Segments | Implanon/Nexplanon    
Segment Reporting Information [Line Items]    
Sales 195 199
Total Pharmaceutical segment sales | Operating Segments | NuvaRing    
Segment Reporting Information [Line Items]    
Sales 63 219
Total Pharmaceutical segment sales | Operating Segments | Singulair    
Segment Reporting Information [Line Items]    
Sales 155 191
Total Pharmaceutical segment sales | Operating Segments | Cozaar/Hyzaar    
Segment Reporting Information [Line Items]    
Sales 102 103
Total Pharmaceutical segment sales | Operating Segments | Nasonex    
Segment Reporting Information [Line Items]    
Sales 71 96
Total Pharmaceutical segment sales | Operating Segments | Arcoxia    
Segment Reporting Information [Line Items]    
Sales 70 75
Total Pharmaceutical segment sales | Operating Segments | Follistim AQ    
Segment Reporting Information [Line Items]    
Sales 41 57
Total Pharmaceutical segment sales | Operating Segments | Other pharmaceutical (3)    
Segment Reporting Information [Line Items]    
Sales 1,194 1,082
Total Pharmaceutical segment sales | United States | Operating Segments    
Segment Reporting Information [Line Items]    
Sales 4,714 4,215
Total Pharmaceutical segment sales | United States | Operating Segments | Keytruda    
Segment Reporting Information [Line Items]    
Sales 1,906 1,284
Total Pharmaceutical segment sales | United States | Operating Segments | Alliance revenue - Lynparza (1)    
Segment Reporting Information [Line Items]    
Sales 85 50
Total Pharmaceutical segment sales | United States | Operating Segments | Alliance revenue - Lenvima (1)    
Segment Reporting Information [Line Items]    
Sales 90 50
Total Pharmaceutical segment sales | United States | Operating Segments | Emend    
Segment Reporting Information [Line Items]    
Sales 5 63
Total Pharmaceutical segment sales | United States | Operating Segments | Gardasil/Gardasil 9    
Segment Reporting Information [Line Items]    
Sales 461 362
Total Pharmaceutical segment sales | United States | Operating Segments | ProQuad/M-M-R II/Varivax    
Segment Reporting Information [Line Items]    
Sales 333 343
Total Pharmaceutical segment sales | United States | Operating Segments | Pneumovax 23    
Segment Reporting Information [Line Items]    
Sales 182 125
Total Pharmaceutical segment sales | United States | Operating Segments | RotaTeq    
Segment Reporting Information [Line Items]    
Sales 140 154
Total Pharmaceutical segment sales | United States | Operating Segments | Vaqta    
Segment Reporting Information [Line Items]    
Sales 30 29
Total Pharmaceutical segment sales | United States | Operating Segments | Bridion    
Segment Reporting Information [Line Items]    
Sales 143 119
Total Pharmaceutical segment sales | United States | Operating Segments | Noxafil    
Segment Reporting Information [Line Items]    
Sales 8 91
Total Pharmaceutical segment sales | United States | Operating Segments | Invanz    
Segment Reporting Information [Line Items]    
Sales 6 14
Total Pharmaceutical segment sales | United States | Operating Segments | Prevymis    
Segment Reporting Information [Line Items]    
Sales 26 18
Total Pharmaceutical segment sales | United States | Operating Segments | Cancidas    
Segment Reporting Information [Line Items]    
Sales 3 1
Total Pharmaceutical segment sales | United States | Operating Segments | Primaxin    
Segment Reporting Information [Line Items]    
Sales 0 0
Total Pharmaceutical segment sales | United States | Operating Segments | Cubicin    
Segment Reporting Information [Line Items]    
Sales 15 42
Total Pharmaceutical segment sales | United States | Operating Segments | Zerbaxa    
Segment Reporting Information [Line Items]    
Sales 20 12
Total Pharmaceutical segment sales | United States | Operating Segments | Simponi    
Segment Reporting Information [Line Items]    
Sales 0 0
Total Pharmaceutical segment sales | United States | Operating Segments | Remicade    
Segment Reporting Information [Line Items]    
Sales 0 0
Total Pharmaceutical segment sales | United States | Operating Segments | Belsomra    
Segment Reporting Information [Line Items]    
Sales 27 24
Total Pharmaceutical segment sales | United States | Operating Segments | Isentress/Isentress HD    
Segment Reporting Information [Line Items]    
Sales 75 108
Total Pharmaceutical segment sales | United States | Operating Segments | Zepatier    
Segment Reporting Information [Line Items]    
Sales 18 33
Total Pharmaceutical segment sales | United States | Operating Segments | Zetia    
Segment Reporting Information [Line Items]    
Sales (2) 0
Total Pharmaceutical segment sales | United States | Operating Segments | Vytorin    
Segment Reporting Information [Line Items]    
Sales 3 3
Total Pharmaceutical segment sales | United States | Operating Segments | Atozet    
Segment Reporting Information [Line Items]    
Sales 0 0
Total Pharmaceutical segment sales | United States | Operating Segments | Adempas    
Segment Reporting Information [Line Items]    
Sales 0 0
Total Pharmaceutical segment sales | United States | Operating Segments | Alliance revenue - Adempas (2)    
Segment Reporting Information [Line Items]    
Sales 49 40
Total Pharmaceutical segment sales | United States | Operating Segments | Januvia    
Segment Reporting Information [Line Items]    
Sales 355 384
Total Pharmaceutical segment sales | United States | Operating Segments | Janumet    
Segment Reporting Information [Line Items]    
Sales 113 167
Total Pharmaceutical segment sales | United States | Operating Segments | Implanon/Nexplanon    
Segment Reporting Information [Line Items]    
Sales 149 149
Total Pharmaceutical segment sales | United States | Operating Segments | NuvaRing    
Segment Reporting Information [Line Items]    
Sales 26 185
Total Pharmaceutical segment sales | United States | Operating Segments | Singulair    
Segment Reporting Information [Line Items]    
Sales 5 5
Total Pharmaceutical segment sales | United States | Operating Segments | Cozaar/Hyzaar    
Segment Reporting Information [Line Items]    
Sales 7 4
Total Pharmaceutical segment sales | United States | Operating Segments | Nasonex    
Segment Reporting Information [Line Items]    
Sales 6 (1)
Total Pharmaceutical segment sales | United States | Operating Segments | Arcoxia    
Segment Reporting Information [Line Items]    
Sales 0 0
Total Pharmaceutical segment sales | United States | Operating Segments | Follistim AQ    
Segment Reporting Information [Line Items]    
Sales 21 29
Total Pharmaceutical segment sales | United States | Operating Segments | Other pharmaceutical (3)    
Segment Reporting Information [Line Items]    
Sales 409 328
Total Pharmaceutical segment sales | International | Operating Segments    
Segment Reporting Information [Line Items]    
Sales 5,941 5,448
Total Pharmaceutical segment sales | International | Operating Segments | Keytruda    
Segment Reporting Information [Line Items]    
Sales 1,378 985
Total Pharmaceutical segment sales | International | Operating Segments | Alliance revenue - Lynparza (1)    
Segment Reporting Information [Line Items]    
Sales 60 29
Total Pharmaceutical segment sales | International | Operating Segments | Alliance revenue - Lenvima (1)    
Segment Reporting Information [Line Items]    
Sales 38 24
Total Pharmaceutical segment sales | International | Operating Segments | Emend    
Segment Reporting Information [Line Items]    
Sales 38 53
Total Pharmaceutical segment sales | International | Operating Segments | Gardasil/Gardasil 9    
Segment Reporting Information [Line Items]    
Sales 636 476
Total Pharmaceutical segment sales | International | Operating Segments | ProQuad/M-M-R II/Varivax    
Segment Reporting Information [Line Items]    
Sales 102 153
Total Pharmaceutical segment sales | International | Operating Segments | Pneumovax 23    
Segment Reporting Information [Line Items]    
Sales 75 59
Total Pharmaceutical segment sales | International | Operating Segments | RotaTeq    
Segment Reporting Information [Line Items]    
Sales 82 57
Total Pharmaceutical segment sales | International | Operating Segments | Vaqta    
Segment Reporting Information [Line Items]    
Sales 30 18
Total Pharmaceutical segment sales | International | Operating Segments | Bridion    
Segment Reporting Information [Line Items]    
Sales 157 136
Total Pharmaceutical segment sales | International | Operating Segments | Noxafil    
Segment Reporting Information [Line Items]    
Sales 87 99
Total Pharmaceutical segment sales | International | Operating Segments | Invanz    
Segment Reporting Information [Line Items]    
Sales 59 58
Total Pharmaceutical segment sales | International | Operating Segments | Prevymis    
Segment Reporting Information [Line Items]    
Sales 33 14
Total Pharmaceutical segment sales | International | Operating Segments | Cancidas    
Segment Reporting Information [Line Items]    
Sales 52 60
Total Pharmaceutical segment sales | International | Operating Segments | Primaxin    
Segment Reporting Information [Line Items]    
Sales 51 59
Total Pharmaceutical segment sales | International | Operating Segments | Cubicin    
Segment Reporting Information [Line Items]    
Sales 31 46
Total Pharmaceutical segment sales | International | Operating Segments | Zerbaxa    
Segment Reporting Information [Line Items]    
Sales 16 14
Total Pharmaceutical segment sales | International | Operating Segments | Simponi    
Segment Reporting Information [Line Items]    
Sales 215 208
Total Pharmaceutical segment sales | International | Operating Segments | Remicade    
Segment Reporting Information [Line Items]    
Sales 88 123
Total Pharmaceutical segment sales | International | Operating Segments | Belsomra    
Segment Reporting Information [Line Items]    
Sales 53 44
Total Pharmaceutical segment sales | International | Operating Segments | Isentress/Isentress HD    
Segment Reporting Information [Line Items]    
Sales 170 147
Total Pharmaceutical segment sales | International | Operating Segments | Zepatier    
Segment Reporting Information [Line Items]    
Sales 37 81
Total Pharmaceutical segment sales | International | Operating Segments | Zetia    
Segment Reporting Information [Line Items]    
Sales 147 140
Total Pharmaceutical segment sales | International | Operating Segments | Vytorin    
Segment Reporting Information [Line Items]    
Sales 50 94
Total Pharmaceutical segment sales | International | Operating Segments | Atozet    
Segment Reporting Information [Line Items]    
Sales 122 94
Total Pharmaceutical segment sales | International | Operating Segments | Adempas    
Segment Reporting Information [Line Items]    
Sales 56 48
Total Pharmaceutical segment sales | International | Operating Segments | Alliance revenue - Adempas (2)    
Segment Reporting Information [Line Items]    
Sales 5 2
Total Pharmaceutical segment sales | International | Operating Segments | Januvia    
Segment Reporting Information [Line Items]    
Sales 419 440
Total Pharmaceutical segment sales | International | Operating Segments | Janumet    
Segment Reporting Information [Line Items]    
Sales 390 364
Total Pharmaceutical segment sales | International | Operating Segments | Implanon/Nexplanon    
Segment Reporting Information [Line Items]    
Sales 45 50
Total Pharmaceutical segment sales | International | Operating Segments | NuvaRing    
Segment Reporting Information [Line Items]    
Sales 37 34
Total Pharmaceutical segment sales | International | Operating Segments | Singulair    
Segment Reporting Information [Line Items]    
Sales 151 186
Total Pharmaceutical segment sales | International | Operating Segments | Cozaar/Hyzaar    
Segment Reporting Information [Line Items]    
Sales 95 99
Total Pharmaceutical segment sales | International | Operating Segments | Nasonex    
Segment Reporting Information [Line Items]    
Sales 65 97
Total Pharmaceutical segment sales | International | Operating Segments | Arcoxia    
Segment Reporting Information [Line Items]    
Sales 70 75
Total Pharmaceutical segment sales | International | Operating Segments | Follistim AQ    
Segment Reporting Information [Line Items]    
Sales 21 28
Total Pharmaceutical segment sales | International | Operating Segments | Other pharmaceutical (3)    
Segment Reporting Information [Line Items]    
Sales 780 754
Total Animal Health segment sales | Operating Segments    
Segment Reporting Information [Line Items]    
Sales 1,214 1,025
Total Animal Health segment sales | Operating Segments | Livestock    
Segment Reporting Information [Line Items]    
Sales 739 611
Total Animal Health segment sales | Operating Segments | Companion Animals    
Segment Reporting Information [Line Items]    
Sales 475 414
Total Animal Health segment sales | United States | Operating Segments    
Segment Reporting Information [Line Items]    
Sales 384 294
Total Animal Health segment sales | United States | Operating Segments | Livestock    
Segment Reporting Information [Line Items]    
Sales 162 117
Total Animal Health segment sales | United States | Operating Segments | Companion Animals    
Segment Reporting Information [Line Items]    
Sales 222 177
Total Animal Health segment sales | International | Operating Segments    
Segment Reporting Information [Line Items]    
Sales 830 731
Total Animal Health segment sales | International | Operating Segments | Livestock    
Segment Reporting Information [Line Items]    
Sales 577 494
Total Animal Health segment sales | International | Operating Segments | Companion Animals    
Segment Reporting Information [Line Items]    
Sales 253 237
Other segment sales (4) | Operating Segments    
Segment Reporting Information [Line Items]    
Sales 23 39
Other segment sales (4) | United States | Operating Segments    
Segment Reporting Information [Line Items]    
Sales 23 39
Other segment sales (4) | International | Operating Segments    
Segment Reporting Information [Line Items]    
Sales $ 0 $ 0