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Acquisitions - Wellpartner Acquisition (Details) $ in Millions | Nov. 30, 2017 USD ($) pharmacy | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
--- | --- | --- | --- | ---
Assets Acquired: |  |  |  |
Goodwill |  | $ 38,451 | $ 38,249 | $ 38,106
Wellpartner Acquisition |  |  |  |
Business Acquisition |  |  |  |
Consideration transferred | $ 380 |  |  |
Number of pharmacies acquired | pharmacy | 2 |  |  |
Assets Acquired: |  |  |  |
Assets | $ 532 |  |  |
Intangible assets | 233 |  |  |
Goodwill | 182 |  |  |
Liabilities | $ 152 |  |  |
Oregon | Wellpartner Acquisition |  |  |  |
Business Acquisition |  |  |  |
Number of pharmacies acquired | pharmacy | 1 |  |  |

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