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Goodwill and Intangible Assets - Goodwill (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 02, 2018
Goodwill |  |  |  |
Goodwill, impairment loss |  | $ 3,921 | $ 135 |
Goodwill |  |  |  |
Goodwill, beginning balance |  | 38,451 |  |
Acquisitions |  | 102 |  |
Foreign currency translation adjustments |  | (18) |  |
Divestiture of RxCrossroads subsidiary |  | (398) |  |
Impairment |  | (3,921) | (135) |
Goodwill, ending balance |  | 34,216 |  |
Pharmacy Services Segment |  |  |  |
Goodwill |  |  |  |
Goodwill, beginning balance |  | 21,819 |  |
Acquisitions |  | 67 |  |
Goodwill, ending balance |  | 21,886 |  |
Retail/LTC Segment |  |  |  |
Goodwill |  |  |  |
Goodwill, impairment loss |  | 3,921 |  |
Goodwill |  |  |  |
Goodwill, beginning balance |  | 16,632 |  |
Acquisitions |  | 35 |  |
Foreign currency translation adjustments |  | (18) |  |
Divestiture of RxCrossroads subsidiary |  | (398) |  |
Impairment |  | (3,921) |  |
Goodwill, ending balance |  | 12,330 |  |
Rx Crossroads |  |  |  |
Goodwill |  |  |  |
Goodwill, impairment loss |  |  | 135 |
Goodwill |  |  |  |
Impairment |  |  | $ (135) |
Disposal group |  |  |  |
Consideration |  |  |  | $ 725
LTC reporting unit |  |  |  |
Goodwill |  |  |  |
Goodwill, impairment loss | $ 3,900 |  |  |
Goodwill |  |  |  |
Impairment | $ (3,900) |  |  |
Goodwill, ending balance |  | $ 2,700 |  |

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