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Segment Reporting - Retrospective Adjustments to Segment Composition (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Total revenues | $ 357,776 | $ 322,467 | $ 292,111
Adjusted operating income | 17,534 | 18,037 | 17,227
Operating Segments | Health Care Benefits |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Total revenues | 105,646 | 91,350 | 82,119
Adjusted operating income | 5,577 | 6,338 | 5,110
Operating Segments | Health Services |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Total revenues | 186,843 | 169,576 | 153,892
Adjusted operating income | 7,312 | 6,781 | 6,492
Operating Segments | Pharmacy & Consumer Wellness |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Total revenues | 116,763 | 108,596 | 101,620
Adjusted operating income | 5,963 | 6,531 | 7,260
Corporate/ Other | Corporate/ Other |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Total revenues | 451 | 530 | 721
Adjusted operating income | (1,318) | (1,613) | (1,635)
Intersegment Eliminations |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Total revenues | (51,927) | (47,585) | (46,241)
Adjusted operating income | $ 0 | 0 | 0
As Previously Reported |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Total revenues |  | 322,467 | 292,111
Adjusted operating income |  | 17,532 | 17,312
As Previously Reported | Operating Segments | Health Care Benefits |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Total revenues |  | 91,409 | 82,186
Adjusted operating income |  | 5,984 | 5,012
As Previously Reported | Operating Segments | Health Services |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Total revenues |  | 169,236 | 153,022
Adjusted operating income |  | 7,356 | 6,859
As Previously Reported | Operating Segments | Pharmacy & Consumer Wellness |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Total revenues |  | 106,594 | 100,105
Adjusted operating income |  | 6,705 | 7,623
As Previously Reported | Corporate/ Other | Corporate/ Other |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Total revenues |  | 530 | 721
Adjusted operating income |  | (1,785) | (1,471)
As Previously Reported | Intersegment Eliminations |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Total revenues |  | (45,302) | (43,923)
Adjusted operating income |  | (728) | (711)
Adjustments |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Total revenues |  | 0 | 0
Adjusted operating income |  | 505 | (85)
Adjustments | Operating Segments | Health Care Benefits |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Total revenues |  | (59) | (67)
Adjusted operating income |  | 354 | 98
Adjustments | Operating Segments | Health Services |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Total revenues |  | 340 | 870
Adjusted operating income |  | (575) | (367)
Adjustments | Operating Segments | Pharmacy & Consumer Wellness |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Total revenues |  | 2,002 | 1,515
Adjusted operating income |  | (174) | (363)
Adjustments | Corporate/ Other | Corporate/ Other |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Total revenues |  | 0 | 0
Adjusted operating income |  | 172 | (164)
Adjustments | Intersegment Eliminations |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Total revenues |  | (2,283) | (2,318)
Adjusted operating income |  | $ 728 | $ 711

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