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Acquisitions - Aetna Acquisition (Details) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
Dec. 03, 2017 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) state
Retail/LTC Segment |  |
Business Acquisition |  |
Number of states pharmacies operated | state |  | 49
Aetna Acquisition |  |
Business Acquisition |  |
Cash consideration for shares acquired (dollars per share) | $ / shares | $ 145.00 |
Shares exchanged for each share acquired (in shares) | shares | 0.8378 |
The assigned value per share of acquiree (dollars per share) | $ / shares | $ 207 |
Assigned value of acquiree | $ 69,000 |
Weighted average share price analysis | 5 days |
Consideration transferred | $ 77,000 |
Potential termination fees | $ 2,100 |
Acquisition related costs |  | $ 34
Aetna | Aetna Acquisition |  |
Business Acquisition |  |
Share price (dollars per share) | $ / shares | $ 74.21 |

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e1043-128460 + Details
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