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Segment Reporting - Summarized Financial Information of Segments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Segment Reporting Information [Line Items] |  |  |
Revenues from external customers | $ 267,908 | $ 255,765 | $ 193,919
Net investment income | 798 | 1,011 | 660
Total revenues | 268,706 | 256,776 | 194,579
Adjusted operating income (loss) | 16,008 | 15,339 | 11,261
Depreciation and amortization | 4,441 | 4,371 | 2,718
Operating Segments | Pharmacy Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from external customers | 132,663 | 130,428 | 130,012
Net investment income | 0 | 0 | 0
Total revenues | 141,938 | 141,491 | 134,736
Adjusted operating income (loss) | 5,688 | 5,129 | 4,955
Depreciation and amortization | 612 | 766 | 710
Co-payments | 10,900 | 11,500 | 11,400
Operating Segments | Retail/ LTC |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from external customers | 60,208 | 56,258 | 54,999
Net investment income | 0 | 0 | 0
Total revenues | 91,198 | 86,608 | 83,989
Adjusted operating income (loss) | 6,146 | 6,705 | 7,403
Depreciation and amortization | 1,801 | 1,723 | 1,698
Operating Segments | Health Care Benefits |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from external customers | 74,926 | 68,979 | 8,904
Net investment income | 483 | 599 | 58
Total revenues | 75,467 | 69,604 | 8,962
Adjusted operating income (loss) | 6,188 | 5,202 | 528
Depreciation and amortization | 1,832 | 1,721 | 172
Intersegment Eliminations |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | (40,323) | (41,439) | (33,714)
Net investment income | 0 | 0 | 0
Total revenues | (40,323) | (41,439) | (33,714)
Adjusted operating income (loss) | (708) | (697) | (769)
Depreciation and amortization | 0 | 0 | 0
Intersegment Eliminations | Pharmacy Services |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 9,275 | 11,063 | 4,724
Intersegment Eliminations | Retail/ LTC |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 30,990 | 30,350 | 28,990
Intersegment Eliminations | Health Care Benefits |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 58 | 26 | 0
Corporate/ Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues from external customers | 111 | 100 | 4
Net investment income | 315 | 412 | 602
Total revenues | 426 | 512 | 606
Adjusted operating income (loss) | (1,306) | (1,000) | (856)
Depreciation and amortization | $ 196 | $ 161 | $ 138

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