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Acquisition of Aetna - Narrative (Details) $ / shares in Units, $ in Millions |  | 1 Months Ended |
--- | --- | --- | ---
Nov. 28, 2018 USD ($) $ / shares | Dec. 31, 2018 USD ($) clinic store | Dec. 31, 2017 USD ($)
Business Acquisition [Line Items] |  |  |
Long-term Debt |  | $ 73,429 | $ 27,002
Number of stores | store |  | 9,900 |
Number of walk-in medical clinics | clinic |  | 1,100 |
Aetna Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Business acquisition, share price (in dollars per share) | $ / shares | $ 145.00 |  |
Per share exchange ratio | $ / shares | 0.84 |  |
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 |  |
Long-term Debt | 45,000 |  |
Deductible goodwill | 165 |  |
Deferred income taxes | $ 4,574 |  |
Revenue of acquiree since acquisition date |  | $ 5,600 |
Income (loss) of acquiree since acquisition date |  | 146 |
Business acquisition transaction costs |  | $ 147 | $ 34

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