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Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from customers | $ 64,547 | $ 47,269 | $ 189,082 | $ 139,670
Net investment income | 263 | 221 | 805 | 485
Total revenues | 64,810 | 47,490 | 189,887 | 140,155
Pharmacy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from customers | 42,552 | 41,768 | 121,744 | 122,020
Front Store |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from customers | 4,614 | 4,557 | 14,288 | 13,990
Premiums |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from customers | 15,539 | 627 | 47,612 | 2,684
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from customers | 1,842 | 317 | 5,438 | 976
Operating Segments | Pharmacy Services Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from customers | 36,018 | 33,864 | 104,418 | 99,837
Net investment income | 0 | 0 | 0 | 0
Total revenues | 36,018 | 33,864 | 104,418 | 99,837
Operating Segments | Retail Long-Term Care Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from customers | 21,466 | 20,856 | 64,028 | 61,960
Net investment income | 0 | 0 | 0 | 0
Total revenues | 21,466 | 20,856 | 64,028 | 61,960
Operating Segments | Health Care Benefits Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from customers | 17,035 | 637 | 51,996 | 2,713
Net investment income | 146 | 4 | 458 | 10
Total revenues | 17,181 | 641 | 52,454 | 2,723
Operating Segments | Corporate / Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from customers | 35 | 0 | 76 | 0
Net investment income | 117 | 217 | 347 | 475
Total revenues | 152 | 217 | 423 | 475
Operating Segments | Pharmacy | Pharmacy Services Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from customers | 35,872 | 33,733 | 103,983 | 99,432
Operating Segments | Pharmacy | Retail Long-Term Care Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from customers | 16,687 | 16,123 | 49,197 | 47,428
Operating Segments | Pharmacy | Health Care Benefits Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from customers | 0 | 0 | 0 | 0
Operating Segments | Pharmacy | Corporate / Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from customers | 0 | 0 | 0 | 0
Operating Segments | Front Store | Pharmacy Services Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from customers | 0 | 0 | 0 | 0
Operating Segments | Front Store | Retail Long-Term Care Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from customers | 4,614 | 4,557 | 14,288 | 13,990
Operating Segments | Front Store | Health Care Benefits Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from customers | 0 | 0 | 0 | 0
Operating Segments | Front Store | Corporate / Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from customers | 0 | 0 | 0 | 0
Operating Segments | Premiums | Pharmacy Services Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from customers | 0 | 0 | 0 | 0
Operating Segments | Premiums | Retail Long-Term Care Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from customers | 0 | 0 | 0 | 0
Operating Segments | Premiums | Health Care Benefits Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from customers | 15,507 | 627 | 47,543 | 2,684
Operating Segments | Premiums | Corporate / Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from customers | 32 | 0 | 69 | 0
Operating Segments | Other | Pharmacy Services Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from customers | 146 | 131 | 435 | 405
Operating Segments | Other | Retail Long-Term Care Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from customers | 165 | 176 | 543 | 542
Operating Segments | Other | Health Care Benefits Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from customers | 1,528 | 10 | 4,453 | 29
Operating Segments | Other | Corporate / Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from customers | 3 | 0 | 7 | 0
Operating Segments | Pharmacy network | Pharmacy Services Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from customers | 22,469 | 21,921 | 66,071 | 64,625
Operating Segments | Mail choice | Pharmacy Services Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from customers | 13,403 | 11,812 | 37,912 | 34,807
Operating Segments | Other | Pharmacy Services Segment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from customers | 146 | 131 | 435 | 405
Intersegment Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from customers | (10,007) | (8,088) | (31,436) | (24,840)
Net investment income | 0 | 0 | 0 | 0
Total revenues | (10,007) | (8,088) | (31,436) | (24,840)
Intersegment Eliminations | Pharmacy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from customers | (10,007) | (8,088) | (31,436) | (24,840)
Total revenues | (10,007) | (8,088) | (31,436) | (24,840)
Intersegment Eliminations | Front Store |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from customers | 0 | 0 | 0 | 0
Intersegment Eliminations | Premiums |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from customers | 0 | 0 | 0 | 0
Intersegment Eliminations | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues from customers | $ 0 | $ 0 | $ 0 | $ 0

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