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Collaborative Arrangements - Schedule of Collaborative Arrangement Transactions (Details) - Collaborative Arrangement - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Bayer AG |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Receivables from counterparty | $ 27 |  | $ 27 |  | $ 33
Payables to counterparty | 375 |  | 375 |  | 352
Bayer AG | Revenue |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Net product sales recorded by Merck | 47 | $ 36 | 90 | $ 67 |
Merck’s profit share from sales in Bayer's marketing territories | 28 | 31 | 53 | 84 |
Total sales | 75 | 67 | 143 | 151 |
Bayer AG | Materials and production |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Expenses | 132 | 24 | 159 | 47 |
Bayer AG | Marketing and administrative |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Expenses | 10 | 5 | 17 | 11 |
Bayer AG | Research and development |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Expenses | 28 | $ 25 | 56 | $ 51 |
Eisai |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Receivables from counterparty | 35 |  | 35 |  |
Payables to counterparty | 677 |  | 677 |  |
Eisai | Revenue |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Total sales | 35 |  |  |  |
Eisai | Materials and production |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Expenses | 1 |  |  |  |
Eisai | Marketing and administrative |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Expenses | 2 |  |  |  |
Eisai | Research and development |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Expenses | 36 |  |  |  |
AstraZeneca |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Receivables from counterparty | 40 |  | 40 |  | 12
Payables to counterparty | 990 |  | 990 |  | $ 643
AstraZeneca | Revenue |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Total sales | 44 |  | 76 |  |
AstraZeneca | Materials and production |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Expenses | 24 |  | 36 |  |
AstraZeneca | Marketing and administrative |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Expenses | 9 |  | 16 |  |
AstraZeneca | Research and development |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Expenses | $ 42 |  | $ 71 |  |

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