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Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 321,629 | $ 290,912 | $ 267,908
Net investment income (loss) | 838 | 1,199 | 798
Total revenues | 322,467 | 292,111 | 268,706
Pharmacy |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 205,121 | 184,618 | 171,289
Front Store |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 22,780 | 21,315 | 19,655
Premiums |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 85,330 | 76,132 | 69,364
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 8,398 | 8,847 | 7,600
Operating Segments | Health Care Benefits |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 90,844 | 81,515 | 74,926
Net investment income (loss) | 476 | 586 | 483
Total revenues | 91,409 | 82,186 | 75,467
Operating Segments | Health Care Benefits | Pharmacy |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0 | 0 | 0
Operating Segments | Health Care Benefits | Front Store |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0 | 0 | 0
Operating Segments | Health Care Benefits | Premiums |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 85,274 | 76,064 | 69,301
Operating Segments | Health Care Benefits | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 5,659 | 5,536 | 5,683
Operating Segments | Pharmacy Services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 157,787 | 143,194 | 132,663
Net investment income (loss) | 0 | 0 | 0
Total revenues | 169,236 | 153,022 | 141,938
Operating Segments | Pharmacy Services | Pharmacy network |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 97,668 | 91,715 | 85,045
Operating Segments | Pharmacy Services | Mail choice |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 70,466 | 60,547 | 56,071
Operating Segments | Pharmacy Services | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 1,102 | 760 | 822
Operating Segments | Pharmacy Services | Pharmacy |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 168,134 | 152,262 | 141,116
Operating Segments | Pharmacy Services | Front Store |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0 | 0 | 0
Operating Segments | Pharmacy Services | Premiums |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0 | 0 | 0
Operating Segments | Pharmacy Services | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,102 | 760 | 822
Operating Segments | Retail/ LTC |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 72,874 | 66,078 | 60,208
Net investment income (loss) | (44) | 17 | 0
Total revenues | 106,594 | 100,105 | 91,198
Operating Segments | Retail/ LTC | Pharmacy |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 82,010 | 76,121 | 70,176
Operating Segments | Retail/ LTC | Front Store |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 22,780 | 21,315 | 19,655
Operating Segments | Retail/ LTC | Premiums |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0 | 0 | 0
Operating Segments | Retail/ LTC | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,848 | 2,652 | 1,367
Corporate/ Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 124 | 125 | 111
Net investment income (loss) | 406 | 596 | 315
Total revenues | 530 | 721 | 426
Corporate/ Other | Pharmacy |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0 | 0 | 0
Corporate/ Other | Front Store |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0 | 0 | 0
Corporate/ Other | Premiums |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 56 | 68 | 63
Corporate/ Other | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 68 | 57 | 48
Intersegment Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Net investment income (loss) | 0 | 0 | 0
Total revenues | (45,302) | (43,923) | (40,323)
Intersegment Eliminations | Pharmacy |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | (45,023) | (43,765) | (40,003)
Intersegment Eliminations | Front Store |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0 | 0 | 0
Intersegment Eliminations | Premiums |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0 | 0 | 0
Intersegment Eliminations | Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ (279) | $ (158) | $ (320)

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