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Goodwill and Other Intangible Assets - Goodwill (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 02, 2018
Goodwill [Roll Forward] |  |  |  |  |  |  |  |
Balance, beginning of the period |  |  |  |  | $ 38,451 | $ 38,249 |  |
Acquisitions |  |  |  |  | 46,788 | 385 |  |
Foreign currency translation adjustments |  |  |  |  | (14) | (2) |  |
Divestiture of RxCrossroads subsidiary |  |  |  |  | (398) |  |  |
Impairments |  |  |  |  | (6,149) | (181) | $ 0 |
Balance, end of the period | $ 78,678 |  | $ 38,451 |  | 78,678 | 38,451 | 38,249 |
Pharmacy Services |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |
Balance, beginning of the period |  |  |  |  | 21,819 | 21,637 |  |
Acquisitions |  |  |  |  | 1,569 | 182 |  |
Foreign currency translation adjustments |  |  |  |  | 0 | 0 |  |
Divestiture of RxCrossroads subsidiary |  |  |  |  | 0 |  |  |
Impairments |  |  |  |  | 0 | 0 |  |
Balance, end of the period | 23,388 |  | 21,819 |  | 23,388 | 21,819 | 21,637 |
Retail/LTC |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |
Balance, beginning of the period |  |  |  |  | 16,632 | 16,612 |  |
Acquisitions |  |  |  |  | 735 | 203 |  |
Foreign currency translation adjustments |  |  |  |  | (14) | (2) |  |
Divestiture of RxCrossroads subsidiary |  |  |  |  | (398) |  |  |
Impairments |  |  |  |  | (6,149) | (181) |  |
Balance, end of the period | 10,806 |  | 16,632 |  | 10,806 | 16,632 | 16,612 |
Health Care Benefits |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |
Balance, beginning of the period |  |  |  |  | 0 | 0 |  |
Acquisitions |  |  |  |  | 44,484 | 0 |  |
Foreign currency translation adjustments |  |  |  |  | 0 | 0 |  |
Divestiture of RxCrossroads subsidiary |  |  |  |  | 0 |  |  |
Impairments |  |  |  |  | 0 | 0 |  |
Balance, end of the period | 44,484 |  | 0 |  | 44,484 | 0 | $ 0 |
Long-Term Care Reporting Unit | Retail/LTC |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |
Impairments | (2,200) | $ (3,900) |  |  |  |  |  |
Balance, end of the period | $ 431 |  |  |  | $ 431 |  |  |
RX Crossroads |  |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |
Impairments |  |  | $ (46) | $ (135) |  |  |  |
TCJA, deferred tax liability, provisional income tax benefit |  |  |  |  |  | 47 |  |
Increase in carrying amount of reporting unit |  |  |  |  |  | $ 47 |  |
Disposal consideration received |  |  |  |  |  |  |  | $ 725

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