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Acquisition of Aetna (Details) $ / shares in Units, $ in Billions | Nov. 28, 2018 USD ($) $ / shares | Jun. 30, 2019 building clinic
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Business Acquisition [Line Items] |  |
Number of stores | building |  | 9,900
Number of walk in medical clinics | clinic |  | 1,100
Aetna Inc. |  |
Business Acquisition [Line Items] |  |
Percentage of voting interests acquired | 100.00% |
Cash received by shareholders (in dollars per share) | $ / shares | $ 145.00 |
Per share exchange ratio (in shares) | $ / shares | 0.8378 |
Acquisition value per share acquired (in dollars per share) | $ / shares | $ 212 |
Consideration transferred | $ | $ 70 |
Acquisition assigned value of acquiree | $ | 78 |
Business combination, long-term debt | $ | $ 45 |

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