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Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Disaggregation of Revenue [Line Items] |  |
Net investment income | $ 162 | $ 249
Total revenues | 66,755 | 61,646
Pharmacy Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 34,983 | 33,558
Retail/ LTC |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 22,749 | 21,115
Health Care Benefits |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 19,198 | 17,870
Corporate/ Other |  |
Disaggregation of Revenue [Line Items] |  |
Net investment income | 69 | 85
Total revenues | 90 | 110
Pharmacy |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 41,872 | 38,530
Pharmacy | Corporate/ Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Front Store |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 5,208 | 4,799
Front Store | Corporate/ Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Premiums |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 17,640 | 16,282
Premiums | Corporate/ Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 19 | 23
Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,873 | 1,786
Other | Corporate/ Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 2 | 2
Operating Segments | Pharmacy Services |  |
Disaggregation of Revenue [Line Items] |  |
Net investment income | 0 | 0
Total revenues | 34,983 | 33,558
Operating Segments | Retail/ LTC |  |
Disaggregation of Revenue [Line Items] |  |
Net investment income | 0 | 0
Total revenues | 22,749 | 21,115
Operating Segments | Health Care Benefits |  |
Disaggregation of Revenue [Line Items] |  |
Net investment income | 93 | 164
Total revenues | 19,198 | 17,870
Operating Segments | Pharmacy | Pharmacy Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 34,774 | 33,413
Operating Segments | Pharmacy | Retail/ LTC |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 17,355 | 16,118
Operating Segments | Pharmacy | Health Care Benefits |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Operating Segments | Front Store | Pharmacy Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Operating Segments | Front Store | Retail/ LTC |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 5,208 | 4,799
Operating Segments | Front Store | Health Care Benefits |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Operating Segments | Premiums | Pharmacy Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Operating Segments | Premiums | Retail/ LTC |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Operating Segments | Premiums | Health Care Benefits |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 17,621 | 16,259
Operating Segments | Other | Pharmacy Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 209 | 145
Operating Segments | Other | Retail/ LTC |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 186 | 198
Operating Segments | Other | Health Care Benefits |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,484 | 1,447
Operating Segments | Pharmacy network | Pharmacy Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 13,674 | 11,881
Operating Segments | Mail choice | Pharmacy Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 21,100 | 21,532
Operating Segments | Other | Pharmacy Services |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 209 | 145
Intersegment Eliminations |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | (10,265) | (11,007)
Net investment income | 0 | 0
Total revenues | (10,265) | (11,007)
Intersegment Eliminations | Pharmacy Services |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 2,865 | 3,732
Intersegment Eliminations | Retail/ LTC |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 7,392 | 7,269
Intersegment Eliminations | Health Care Benefits |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 8 | 6
Intersegment Eliminations | Corporate/ Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Intersegment Eliminations | Pharmacy |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | (10,257) | (11,001)
Intersegment Eliminations | Front Store |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Intersegment Eliminations | Premiums |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Intersegment Eliminations | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ (8) | $ (6)

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