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Acquisitions (Details) $ / shares in Units, $ in Billions | Nov. 29, 2018 USD ($) | Mar. 31, 2019 building clinic | Nov. 28, 2018 USD ($) $ / shares
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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. [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Per Share Exchange Ratio | $ / shares |  |  | $ 0.8378
Business Combination, Acquisition Value Per Share Acquired | $ / shares |  |  | 212
Business Combination, Consideration Transferred | $ | $ 70 |  |
Business Acquisition, Share Price | $ / shares |  |  | $ 145.00
Business Combination Acquisition Assigned Value Of Acquiree | $ |  |  | $ 78
Long-term Debt | $ |  |  | $ 45

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