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Summary of Significant Accounting Policies Significant Accounting Policies - Narrative (Details) person in Millions, patient in Millions, Plans in Millions, $ in Millions | 3 Months Ended
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Mar. 31, 2019 USD ($) person Plans building clinic patient Segment state | Mar. 31, 2018 USD ($)
Accounting Policies - Narrative [Abstract] |  |
Number of Stores | building | 9,900 |
Number of Walk In Medical Clinics | clinic | 1,100 |
Number of Pharmacy Plan Members | Plans | 94 |
Number of Patients Served per Year | patient | 1 |
Number of People Served through Health Insurance Products and Related Services | person | 38 |
Number of Reportable Segments | Segment | 4 |
Related Party Transaction, Expenses from Transactions with Related Party | $ 10 | $ 22
Number of States in which Entity Operates | state | 4 |
Related Party Transaction, Other Revenues from Transactions with Related Party | $ 25 | $ 35

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- Definition Represents the number of stores. + References No definition available. + Details
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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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