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Acquisition of Aetna - Goodwill (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Nov. 28, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Business Combination Segment Allocation [Line Items] |  |  |  |
Goodwill | $ 78,678 |  | $ 38,451 | $ 38,249
Health Care Benefits |  |  |  |
Business Combination Segment Allocation [Line Items] |  |  |  |
Goodwill | 44,484 |  | 0 | 0
Pharmacy Services |  |  |  |
Business Combination Segment Allocation [Line Items] |  |  |  |
Goodwill | 23,388 |  | 21,819 | 21,637
Retail/LTC |  |  |  |
Business Combination Segment Allocation [Line Items] |  |  |  |
Goodwill | $ 10,806 |  | $ 16,632 | $ 16,612
Aetna Inc. |  |  |  |
Business Combination Segment Allocation [Line Items] |  |  |  |
Goodwill |  | $ 46,684 |  |
Aetna Inc. | Health Care Benefits |  |  |  |
Business Combination Segment Allocation [Line Items] |  |  |  |
Goodwill |  | 44,484 |  |
Aetna Inc. | Pharmacy Services |  |  |  |
Business Combination Segment Allocation [Line Items] |  |  |  |
Goodwill |  | 1,500 |  |
Aetna Inc. | Retail/LTC |  |  |  |
Business Combination Segment Allocation [Line Items] |  |  |  |
Goodwill |  | $ 700 |  |

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