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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Revenue, Major Customer [Line Items] |  |  |  |
Revenues from customers | $ 63,138 | $ 46,708 | $ 124,535 | $ 92,401
Net investment income | 293 | 214 | 542 | 264
Total revenues | 63,431 | 46,922 | 125,077 | 92,665
Adjusted operating income (loss) | 4,031 | 2,599 | 7,626 | 4,892
Operating Segments | Pharmacy Services Segment |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues from customers | 34,842 | 33,427 | 68,400 | 65,973
Net investment income | 0 | 0 | 0 | 0
Total revenues | 34,842 | 33,427 | 68,400 | 65,973
Adjusted operating income (loss) | 1,296 | 1,181 | 2,243 | 2,168
Net revenues, retail copayments | 2,900 | 2,800 | 6,200 | 6,100
Operating Segments | Retail Long-Term Care Segment |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues from customers | 21,447 | 20,672 | 42,562 | 41,104
Net investment income | 0 | 0 | 0 | 0
Total revenues | 21,447 | 20,672 | 42,562 | 41,104
Adjusted operating income (loss) | 1,669 | 1,821 | 3,158 | 3,657
Operating Segments | Health Care Benefits Segment |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues from customers | 17,255 | 760 | 34,961 | 2,076
Net investment income | 148 | 4 | 312 | 6
Total revenues | 17,403 | 764 | 35,273 | 2,082
Adjusted operating income (loss) | 1,438 | 0 | 3,000 | (137)
Operating Segments | Corporate / Other |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues from customers | 16 | 0 | 41 | 0
Net investment income | 145 | 210 | 230 | 258
Total revenues | 161 | 210 | 271 | 258
Adjusted operating income (loss) | (202) | (216) | (433) | (434)
Intersegment Eliminations |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenues from customers | (10,422) | (8,151) | (21,429) | (16,752)
Net investment income | 0 | 0 | 0 | 0
Total revenues | (10,422) | (8,151) | (21,429) | (16,752)
Adjusted operating income (loss) | $ (170) | $ (187) | $ (342) | $ (362)

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