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Segment Reporting - Reconciliation of Financial Measures of Segments to Consolidated Totals (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Revenue, Major Customer [Line Items] |  |  |  |
Revenues from customers | $ 65,157 | $ 63,138 | $ 131,750 | $ 124,535
Net investment income | 184 | 293 | 346 | 542
Total revenues | 65,341 | 63,431 | 132,096 | 125,077
Adjusted operating income (loss) | 5,328 | 4,031 | 9,441 | 7,626
Pharmacy Services |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Total revenues | 34,889 | 34,842 | 69,872 | 68,400
Retail/ LTC |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Total revenues | 21,662 | 21,447 | 44,411 | 42,562
Health Care Benefits |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Total revenues | 18,468 | 17,403 | 37,666 | 35,273
Corporate/ Other |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Net investment income | 57 | 145 | 126 | 230
Total revenues | 86 | 161 | 176 | 271
Operating Segments | Pharmacy Services |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues from customers | 32,623 | 31,988 | 64,741 | 61,814
Net investment income | 0 | 0 | 0 | 0
Total revenues | 34,889 | 34,842 | 69,872 | 68,400
Adjusted operating income (loss) | 1,327 | 1,296 | 2,508 | 2,243
Net revenues, retail copayments | 2,600 | 2,900 | 6,000 | 6,200
Operating Segments | Retail/ LTC |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues from customers | 14,187 | 13,885 | 29,544 | 27,731
Net investment income | 0 | 0 | 0 | 0
Total revenues | 21,662 | 21,447 | 44,411 | 42,562
Adjusted operating income (loss) | 1,057 | 1,669 | 2,959 | 3,158
Operating Segments | Health Care Benefits |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues from customers | 18,318 | 17,249 | 37,415 | 34,949
Net investment income | 127 | 148 | 220 | 312
Total revenues | 18,468 | 17,403 | 37,666 | 35,273
Adjusted operating income (loss) | 3,464 | 1,438 | 4,955 | 3,000
Operating Segments | Corporate/ Other |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues from customers | 29 | 16 | 50 | 41
Adjusted operating income (loss) | (343) | (202) | (628) | (433)
Intersegment Eliminations |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | (9,764) | (10,422) | (20,029) | (21,429)
Net investment income | 0 | 0 | 0 | 0
Total revenues | (9,764) | (10,422) | (20,029) | (21,429)
Adjusted operating income (loss) | (177) | (170) | (353) | (342)
Intersegment Eliminations | Pharmacy Services |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 2,266 | 2,854 | 5,131 | 6,586
Intersegment Eliminations | Retail/ LTC |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 7,475 | 7,562 | 14,867 | 14,831
Intersegment Eliminations | Health Care Benefits |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | 23 | 6 | 31 | 12
Intersegment Eliminations | Corporate/ Other |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues | $ 0 | $ 0 | $ 0 | $ 0

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