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Accounting Policies - Revenue Disaggregation (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018
Revenue Disaggregation |  |
Net revenue | $ 47,269 | $ 139,670
Pharmacy |  |
Revenue Disaggregation |  |
Net revenue | 41,768 | 122,020
Front Store |  |
Revenue Disaggregation |  |
Net revenue | 4,557 | 13,990
Other |  |
Revenue Disaggregation |  |
Net revenue | 944 | 3,660
Operating Segments | Pharmacy Services Segment |  |
Revenue Disaggregation |  |
Net revenue | 33,763 | 99,228
Operating Segments | Pharmacy Services Segment | Pharmacy |  |
Revenue Disaggregation |  |
Net revenue | 32,995 | 96,110
Operating Segments | Pharmacy Services Segment | Mail choice |  |
Revenue Disaggregation |  |
Net revenue | 11,812 | 34,807
Operating Segments | Pharmacy Services Segment | Pharmacy network |  |
Revenue Disaggregation |  |
Net revenue | 21,183 | 61,303
Operating Segments | Pharmacy Services Segment | Other |  |
Revenue Disaggregation |  |
Net revenue | 768 | 3,118
Operating Segments | Retail/LTC Segment |  |
Revenue Disaggregation |  |
Net revenue | 20,856 | 61,960
Operating Segments | Retail/LTC Segment | Pharmacy |  |
Revenue Disaggregation |  |
Net revenue | 16,123 | 47,428
Operating Segments | Retail/LTC Segment | Front Store |  |
Revenue Disaggregation |  |
Net revenue | 4,557 | 13,990
Operating Segments | Retail/LTC Segment | Other |  |
Revenue Disaggregation |  |
Net revenue | 176 | 542
Intersegment Eliminations |  |
Revenue Disaggregation |  |
Net revenue | (7,350) | (21,518)
Intersegment Eliminations | Pharmacy |  |
Revenue Disaggregation |  |
Net revenue | $ (7,350) | $ (21,518)

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