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Collaborative Arrangements - Schedule of Transactions (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Sales | $ 10,872 | $ 11,760 | $ 22,929 | $ 22,575 |
Cost of sales | 3,159 | 3,401 | 6,471 | 6,453 |
Selling, general and administrative | 2,378 | 2,712 | 4,933 | 5,138 |
Research and development | 2,123 | 2,189 | 4,331 | 4,119 |
Payables, current | 22,178 |  | 22,178 |  | $ 22,220
Other current assets | AstraZeneca | Collaborative Arrangement |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Receivables | 168 |  | 168 |  | 128
Other current assets | Eisai | Collaborative Arrangement |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Receivables | 173 |  | 173 |  | 150
Other current assets | Bayer AG | Collaborative Arrangement |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Receivables | 62 |  | 62 |  | 49
Accounts payable and accrued liabilities | AstraZeneca | Collaborative Arrangement |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Payables, current | 324 |  | 324 |  | 577
Payables, Noncurrent | 400 |  | 400 |  | 0
Accounts payable and accrued liabilities | Eisai | Collaborative Arrangement |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Payables, current | 325 |  | 325 |  | 700
Other Noncurrent Liabilities | Eisai | Collaborative Arrangement |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Payables, Noncurrent | 570 |  | 570 |  | 525
Other Noncurrent Liabilities | Bayer AG | Collaborative Arrangement |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Payables, Noncurrent | 375 |  | 375 |  | $ 375
Revenue | AstraZeneca | Collaborative Arrangement |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Alliance revenue - profit sharing | 178 | 111 | 323 | 190 |
Revenue | Eisai | Collaborative Arrangement |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Alliance revenue - profit sharing | 151 | 97 | 279 | 171 |
Revenue | Bayer AG | Collaborative Arrangement |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Alliance revenue - profit sharing | 79 | 51 | 133 | 94 |
Collaborative Arrangement, Sales, Net | 57 | 53 | 113 | 100 |
Sales | 136 | 104 | 246 | 194 |
Cost of sales | AstraZeneca | Collaborative Arrangement |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Cost of sales | 137 | 73 | 164 | 92 |
Cost of sales | Eisai | Collaborative Arrangement |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Cost of sales | 135 | 23 | 170 | 74 |
Cost of sales | Bayer AG | Collaborative Arrangement |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Cost of sales | 28 | 29 | 57 | 58 |
Selling, general and administrative | AstraZeneca | Collaborative Arrangement |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Selling, general and administrative | 39 | 33 | 72 | 59 |
Selling, general and administrative | Eisai | Collaborative Arrangement |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Selling, general and administrative | 19 | 19 | 31 | 38 |
Selling, general and administrative | Bayer AG | Collaborative Arrangement |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Selling, general and administrative | 17 | 11 | 28 | 20 |
Research and development | AstraZeneca | Collaborative Arrangement |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Research and development | 37 | 33 | 73 | 78 |
Research and development | Eisai | Collaborative Arrangement |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Research and development | 56 | 62 | 120 | 109 |
Research and development | Bayer AG | Collaborative Arrangement |  |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |  |
Research and development | $ 16 | $ 32 | $ 41 | $ 62 |

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