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Significant Accounting Policies - Narrative (Details) person in Millions, patient in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |  |
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Sep. 30, 2019 USD ($) person building clinic patient state | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) person building clinic patient Segment state | Sep. 30, 2018 USD ($) | Jan. 01, 2019 USD ($) | Dec. 31, 2018 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Number of stores | building | 9,900 |  | 9,900 |  |  |
Number of walk in medical clinics | clinic | 1,100 |  | 1,100 |  |  |
Number of pharmacy plan members | person | 102 |  | 102 |  |  |
Number of patients served per year | patient | 1 |  | 1 |  |  |
Number of people served through health insurance products and related services | person | 38 |  | 38 |  |  |
Number of reportable segments | Segment |  |  | 4 |  |  |
Related party transaction, expenses from transactions with related party | $ 14 | $ 4 | $ 26 | $ 34 |  |
Related party transaction, other revenues from transactions with related party | 20 | $ 34 | 72 | $ 105 |  |
Retained earnings | $ 44,017 |  | $ 44,017 |  | $ 41,089 | $ 40,911
Lease renewal term | 5 years |  | 5 years |  |  |
Retail Long-Term Care Segment |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Number of stores | building | 9,900 |  | 9,900 |  |  |
Number of walk in medical clinics | clinic | 1,100 |  | 1,100 |  |  |
Health Care Benefits Segment |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Number of people served through health insurance products and related services | person | 38 |  | 38 |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Retained earnings |  |  |  |  | 178 |
Retained earnings, pre-tax |  |  |  |  | $ 241 |
Equity Method Investee |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Number of states in which entity operates | state | 4 |  | 4 |  |  |

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