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Acquisitions and Divestitures - Narrative (Details) $ / shares in Units, $ in Millions |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 28, 2018 USD ($) $ / shares | Dec. 31, 2018 USD ($) | Dec. 31, 2019 USD ($) clinic store | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jul. 01, 2019 store | Jan. 02, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Loss on sale of subsidiary |  |  | $ (205) | $ (86) | $ 0 |  |
Aetna Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Percentage of voting interests acquired | 100.00% |  |  |  |  |  |
Business acquisition, share price (in dollars per share) | $ / shares | $ 145.00 |  |  |  |  |  |
Per share exchange ratio | $ / shares | 0.8378 |  |  |  |  |  |
The assigned value per share of acquiree (in dollars per share) | $ / shares | $ 212 |  |  |  |  |  |
Consideration transferred in acquisition | $ 70,000 |  |  |  |  |  |
Assigned value of acquiree | 78,000 |  |  |  |  |  |
New debt issued in acquisition | $ 45,000 |  |  |  |  |  |
Revenue of acquiree since acquisition date |  | $ 5,600 |  |  |  |  |
Income of acquiree since acquisition date |  | 146 |  |  |  |  |
Business acquisition transaction costs |  | $ 147 |  | 147 | 34 |  |
Retail/ LTC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of stores | store |  |  | 9,900 |  |  |  |
Number of walk-in medical clinics | clinic |  |  | 1,100 |  |  |  |
Discontinued Operations, Disposed of by Sale | Brazil Subsidiary | Retail/ LTC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of stores | store |  |  |  |  |  | 50 |
Loss on sale of subsidiary |  |  | $ 205 |  |  |  |
Discontinued Operations, Disposed of by Sale | RX Crossroads | Retail/ LTC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Loss on sale of subsidiary |  |  |  | $ 86 | $ 9 |  |
Disposal consideration received |  |  |  |  |  |  | $ 725

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