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Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Net investment income | $ 204 | $ 263 | $ 550 | $ 805
Total revenues | 67,056 | 64,810 | 199,152 | 189,887
Pharmacy Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 35,711 | 36,018 | 105,583 | 104,418
Retail/ LTC |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 22,725 | 21,466 | 67,136 | 64,028
Health Care Benefits |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 18,698 | 17,181 | 56,364 | 52,454
Corporate/ Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net investment income | 83 | 117 | 209 | 347
Total revenues | 116 | 152 | 292 | 423
Pharmacy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 43,062 | 42,560 | 126,725 | 121,764
Pharmacy | Corporate/ Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Front Store |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 4,740 | 4,614 | 14,601 | 14,288
Front Store | Corporate/ Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Premiums |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 17,182 | 15,539 | 51,749 | 47,612
Premiums | Corporate/ Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 17 | 32 | 50 | 69
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,868 | 1,834 | 5,527 | 5,418
Other | Corporate/ Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 16 | 3 | 33 | 7
Operating Segments | Pharmacy Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net investment income | 0 | 0 | 0 | 0
Total revenues | 35,711 | 36,018 | 105,583 | 104,418
Operating Segments | Retail/ LTC |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net investment income | 0 | 0 | 0 | 0
Total revenues | 22,725 | 21,466 | 67,136 | 64,028
Operating Segments | Health Care Benefits |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Net investment income | 121 | 146 | 341 | 458
Total revenues | 18,698 | 17,181 | 56,364 | 52,454
Operating Segments | Pharmacy | Pharmacy Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 35,505 | 35,872 | 104,924 | 103,983
Operating Segments | Pharmacy | Retail/ LTC |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 17,608 | 16,687 | 51,833 | 49,197
Operating Segments | Pharmacy | Health Care Benefits |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Operating Segments | Front Store | Pharmacy Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Operating Segments | Front Store | Retail/ LTC |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 4,740 | 4,614 | 14,601 | 14,288
Operating Segments | Front Store | Health Care Benefits |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Operating Segments | Premiums | Pharmacy Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Operating Segments | Premiums | Retail/ LTC |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Operating Segments | Premiums | Health Care Benefits |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 17,165 | 15,507 | 51,699 | 47,543
Operating Segments | Other | Pharmacy Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 206 | 146 | 659 | 435
Operating Segments | Other | Retail/ LTC |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 377 | 165 | 702 | 543
Operating Segments | Other | Health Care Benefits |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 1,412 | 1,528 | 4,324 | 4,453
Operating Segments | Pharmacy network | Pharmacy Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 21,473 | 22,411 | 63,109 | 65,917
Operating Segments | Mail choice | Pharmacy Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 14,032 | 13,461 | 41,815 | 38,066
Operating Segments | Other | Pharmacy Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total revenues | 206 | 146 | 659 | 435
Intersegment Eliminations |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | (10,194) | (10,007) | (30,223) | (31,436)
Net investment income | 0 | 0 | 0 | 0
Total revenues | (10,194) | (10,007) | (30,223) | (31,436)
Intersegment Eliminations | Pharmacy Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 2,219 | 2,338 | 7,350 | 8,924
Intersegment Eliminations | Retail/ LTC |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 7,955 | 7,661 | 22,822 | 22,492
Intersegment Eliminations | Health Care Benefits |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 20 | 8 | 51 | 20
Intersegment Eliminations | Corporate/ Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Intersegment Eliminations | Pharmacy |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | (10,051) | (9,999) | (30,032) | (31,416)
Intersegment Eliminations | Front Store |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Intersegment Eliminations | Premiums |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0 | 0 | 0 | 0
Intersegment Eliminations | Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ (143) | $ (8) | $ (191) | $ (20)

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