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v3.19.1

Summary of Significant Accounting Policies Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 61,397 | $ 45,693
Net investment income | 249 | 50
Total revenues | 61,646 | 45,743
Pharmacy Services Segment [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 33,558 | 32,546
Net investment income | 0 | 0
Total revenues | 33,558 | 32,546
Retail Long-Term Care Segment [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Net investment income | 0 | 0
Total revenues | 21,115 | 20,432
Health Care Benefits Segment [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 17,870 | 1,318
Corporate / Other [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total revenues | 110 | 48
Pharmacy |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 38,524 | 39,305
Pharmacy | Pharmacy Services Segment [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 33,413 | 32,406
Pharmacy | Retail Long-Term Care Segment [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 16,118 | 15,500
Pharmacy | Health Care Benefits Segment [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Pharmacy | Corporate / Other [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Front Store |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 4,799 | 4,726
Front Store | Pharmacy Services Segment [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Front Store | Retail Long-Term Care Segment [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 4,799 | 4,726
Front Store | Health Care Benefits Segment [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Front Store | Corporate / Other [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Premiums |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 16,282 | 1,306
Premiums | Pharmacy Services Segment [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Premiums | Retail Long-Term Care Segment [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Premiums | Health Care Benefits Segment [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 16,259 | 1,306
Premiums | Corporate / Other [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 23 | 0
Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,792 | 356
Other | Pharmacy Services Segment [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 145 | 140
Other | Retail Long-Term Care Segment [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 198 | 206
Other | Health Care Benefits Segment [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,447 | 10
Other | Corporate / Other [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 2 | 0
Pharmacy network | Pharmacy Services Segment [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 21,574 | 21,198
Mail choice | Pharmacy Services Segment [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 11,839 | 11,208
Other | Pharmacy Services Segment [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 145 | 140
Operating Segments [Member] | Pharmacy Services Segment [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 33,558 | 32,546
Total revenues | 33,558 | 32,546
Operating Segments [Member] | Retail Long-Term Care Segment [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 21,115 | 20,432
Total revenues | 21,115 | 20,432
Operating Segments [Member] | Health Care Benefits Segment [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 17,706 | 1,316
Net investment income | 164 | 2
Total revenues | 17,870 | 1,318
Operating Segments [Member] | Corporate / Other [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 25 | 0
Net investment income | 85 | 48
Total revenues | 110 | 48
Intersegment Eliminations [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | (11,007) | (8,601)
Net investment income | 0 | 0
Total revenues | (11,007) | (8,601)
Intersegment Eliminations [Member] | Front Store |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Intersegment Eliminations [Member] | Premiums |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 | 0
Intersegment Eliminations [Member] | Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 0 | $ 0

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