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Accounting Policies - Revenue Disaggregation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018
Revenue Disaggregation |  |
Net revenue | $ 46,708 | $ 92,401
Pharmacy |  |
Revenue Disaggregation |  |
Net revenue | 40,947 | 80,252
Front Store |  |
Revenue Disaggregation |  |
Net revenue | 4,707 | 9,433
Other |  |
Revenue Disaggregation |  |
Net revenue | 1,054 | 2,716
Operating Segments | Pharmacy Services Segment |  |
Revenue Disaggregation |  |
Net revenue | 33,247 | 65,465
Operating Segments | Pharmacy Services Segment | Pharmacy |  |
Revenue Disaggregation |  |
Net revenue | 32,353 | 63,115
Operating Segments | Pharmacy Services Segment | Mail choice |  |
Revenue Disaggregation |  |
Net revenue | 11,787 | 22,995
Operating Segments | Pharmacy Services Segment | Pharmacy network |  |
Revenue Disaggregation |  |
Net revenue | 20,566 | 40,120
Operating Segments | Pharmacy Services Segment | Other |  |
Revenue Disaggregation |  |
Net revenue | 894 | 2,350
Operating Segments | Retail/LTC Segment |  |
Revenue Disaggregation |  |
Net revenue | 20,672 | 41,104
Operating Segments | Retail/LTC Segment | Pharmacy |  |
Revenue Disaggregation |  |
Net revenue | 15,805 | 31,305
Operating Segments | Retail/LTC Segment | Front Store |  |
Revenue Disaggregation |  |
Net revenue | 4,707 | 9,433
Operating Segments | Retail/LTC Segment | Other |  |
Revenue Disaggregation |  |
Net revenue | 160 | 366
Intersegment Eliminations |  |
Revenue Disaggregation |  |
Net revenue | (7,211) | (14,168)
Intersegment Eliminations | Pharmacy |  |
Revenue Disaggregation |  |
Net revenue | $ (7,211) | $ (14,168)

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