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Segment Reporting - Reconciliation of Financial Measures of Segments to Consolidated Totals (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Revenue, Major Customer [Line Items] |  |
Revenues from customers | $ 66,593 | $ 61,397
Net investment income | 162 | 249
Total revenues | 66,755 | 61,646
Adjusted operating income (loss) | 4,113 | 3,595
Pharmacy Services |  |
Revenue, Major Customer [Line Items] |  |
Total revenues | 34,983 | 33,558
Retail/ LTC |  |
Revenue, Major Customer [Line Items] |  |
Total revenues | 22,749 | 21,115
Health Care Benefits |  |
Revenue, Major Customer [Line Items] |  |
Total revenues | 19,198 | 17,870
Corporate/ Other |  |
Revenue, Major Customer [Line Items] |  |
Net investment income | 69 | 85
Total revenues | 90 | 110
Operating Segments | Pharmacy Services |  |
Revenue, Major Customer [Line Items] |  |
Revenues from customers | 32,118 | 29,826
Net investment income | 0 | 0
Total revenues | 34,983 | 33,558
Adjusted operating income (loss) | 1,181 | 947
Net revenues, retail copayments | 3,400 | 3,300
Operating Segments | Retail/ LTC |  |
Revenue, Major Customer [Line Items] |  |
Revenues from customers | 15,357 | 13,846
Net investment income | 0 | 0
Total revenues | 22,749 | 21,115
Adjusted operating income (loss) | 1,902 | 1,489
Operating Segments | Health Care Benefits |  |
Revenue, Major Customer [Line Items] |  |
Revenues from customers | 19,097 | 17,700
Net investment income | 93 | 164
Total revenues | 19,198 | 17,870
Adjusted operating income (loss) | 1,491 | 1,562
Operating Segments | Corporate/ Other |  |
Revenue, Major Customer [Line Items] |  |
Revenues from customers | 21 | 25
Adjusted operating income (loss) | (285) | (231)
Intersegment Eliminations |  |
Revenue, Major Customer [Line Items] |  |
Revenues | (10,265) | (11,007)
Net investment income | 0 | 0
Total revenues | (10,265) | (11,007)
Adjusted operating income (loss) | (176) | (172)
Intersegment Eliminations | Pharmacy Services |  |
Revenue, Major Customer [Line Items] |  |
Revenues | 2,865 | 3,732
Intersegment Eliminations | Retail/ LTC |  |
Revenue, Major Customer [Line Items] |  |
Revenues | 7,392 | 7,269
Intersegment Eliminations | Health Care Benefits |  |
Revenue, Major Customer [Line Items] |  |
Revenues | 8 | 6
Intersegment Eliminations | Corporate/ Other |  |
Revenue, Major Customer [Line Items] |  |
Revenues | $ 0 | $ 0

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- Definition Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(2)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 + Details
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