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Acquisition and Divestiture (Details) $ / shares in Units, $ in Millions | Nov. 28, 2018 USD ($) $ / shares | Sep. 30, 2019 USD ($) building clinic | Dec. 31, 2018 USD ($)
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Long-term debt |  | $ 69,054 | $ 73,429
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 | $ 70,000 |  |
Acquisition assigned value of acquiree | 78,000 |  |
Long-term debt | $ 45,000 |  |

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