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Goodwill (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Jan. 02, 2018
Goodwill |  |  |
Income tax provision | $ 472 | $ 572 |
Goodwill |  |  |
Goodwill, beginning balance | 38,451 |  |
Acquisitions | 62 |  |
Sale of RxCrossroads reporting unit | (398) |  |
Goodwill, ending balance | 38,115 |  |
Pharmacy Services Segment |  |  |
Goodwill |  |  |
Goodwill, beginning balance | 21,819 |  |
Acquisitions | 26 |  |
Goodwill, ending balance | 21,845 |  |
Retail/LTC Segment |  |  |
Goodwill |  |  |
Goodwill, impairment loss | 199 |  |
Goodwill |  |  |
Goodwill, beginning balance | 16,632 |  |
Acquisitions | 36 |  |
Sale of RxCrossroads reporting unit | (398) |  |
Goodwill, ending balance | $ 16,270 |  |
Rx Crossroads Member |  |  |
Disposal group |  |  |
Consideration |  |  | $ 725

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