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Acquisitions - Target Pharmacy Acquisition (Details) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 16, 2015 USD ($) state clinic pharmacy | Dec. 31, 2015 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Assets Acquired: |  |  |  |
Goodwill |  | $ 38,106,000,000 | $ 38,451,000,000 | $ 38,249,000,000
Target Pharmacy Acquisition |  |  |  |
Business Acquisition |  |  |  |
Consideration transferred | $ 1,900,000,000 |  |  |
Contingent consideration, liability | $ 60,000,000 |  | $ 0 | $ 0
Contingent consideration, liability term (in years) | 3 years |  |  |
Number of pharmacies acquired | pharmacy | 1,672 |  |  |
Number of states pharmacies operated | state | 47 |  |  |
Number of clinics acquired | clinic | 79 |  |  |
Assets Acquired: |  |  |  |
Accounts receivable | $ 2,000,000 |  |  |
Inventories | 467,000,000 |  |  |
Property and equipment | 9,000,000 |  |  |
Intangible assets | 490,000,000 |  |  |
Goodwill | 900,000,000 |  |  |
Total consideration | $ 1,868,000,000 |  |  |
Acquisition related costs |  | $ 26,000,000 |  |
Target Pharmacy Acquisition | Customer Relationships |  |  |  |
Assets Acquired: |  |  |  |
Finite-Lived intangible asset, useful life (in years) | 13 years |  |  |

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