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Goodwill (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jan. 02, 2018
Goodwill |  |  |  |  |  |  |
Goodwill, impairment loss |  | $ 3,921,000,000 | $ 0 | $ 135,000,000 | $ 3,921,000,000 | $ 135,000,000 |
Goodwill |  |  |  |  |  |  |
Goodwill, beginning balance |  |  |  |  | 38,451,000,000 |  |
Acquisitions |  |  |  |  | 102,000,000 |  |
Foreign currency translation adjustments |  |  |  |  | (14,000,000) |  |
Divestiture of RxCrossroads subsidiary |  |  |  |  | (398,000,000) |  |
Impairment |  | (3,921,000,000) | $ 0 | (135,000,000) | (3,921,000,000) | (135,000,000) |
Goodwill, ending balance | $ 34,220,000,000 | 34,220,000,000 |  |  | 34,220,000,000 |  |
Pharmacy Services Segment |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |
Goodwill, beginning balance |  |  |  |  | 21,819,000,000 |  |
Acquisitions |  |  |  |  | 67,000,000 |  |
Goodwill, ending balance | 21,886,000,000 | 21,886,000,000 |  |  | 21,886,000,000 |  |
Retail/LTC Segment |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |
Goodwill, impairment loss |  |  |  |  | 3,921,000,000 |  |
Goodwill |  |  |  |  |  |  |
Goodwill, beginning balance |  |  |  |  | 16,632,000,000 |  |
Acquisitions |  |  |  |  | 35,000,000 |  |
Foreign currency translation adjustments |  |  |  |  | (14,000,000) |  |
Divestiture of RxCrossroads subsidiary |  |  |  |  | (398,000,000) |  |
Impairment |  |  |  |  | (3,921,000,000) |  |
Goodwill, ending balance | 12,334,000,000 | 12,334,000,000 |  |  | 12,334,000,000 |  |
Rx Crossroads |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |
Goodwill, impairment loss |  |  |  | 135,000,000 |  | 135,000,000 |
Goodwill |  |  |  |  |  |  |
Impairment |  |  |  | $ (135,000,000) |  | $ (135,000,000) |
Disposal group |  |  |  |  |  |  |
Consideration |  |  |  |  |  |  | $ 725,000,000
LTC reporting unit |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |
Goodwill, impairment loss |  | 3,900,000,000 |  |  | 3,900,000,000 |  |
Fair value exceeding carrying value (as a percent) |  |  | 1.00% |  |  |  |
Intangible asset impairment | 0 |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |
Impairment |  | (3,900,000,000) |  |  | (3,900,000,000) |  |
Goodwill, ending balance | $ 2,700,000,000 | $ 2,700,000,000 |  |  | $ 2,700,000,000 |  |

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