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Segment Reporting - Retrospective Adjustments to Segment Composition (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total revenues $ 322,467 $ 292,111 $ 268,706
Adjusted operating income 18,037 17,227 15,956
Corporate/ Other      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total revenues 530 721 426
Adjusted operating income (1,613) (1,635) (1,319)
Intersegment Eliminations      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total revenues (47,585) (46,241) (42,062)
Adjusted operating income 0 0 0
Health Care Benefits | Operating Segments      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total revenues 91,350 82,119 75,409
Adjusted operating income 6,338 5,110 6,135
Health Services | Operating Segments      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total revenues 169,576 153,892 141,354
Adjusted operating income 6,781 6,492 5,128
Pharmacy & Consumer Wellness | Operating Segments      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total revenues 108,596 101,620 93,579
Adjusted operating income 6,531 7,260 6,012
As Reported      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total revenues 322,467 292,111 268,706
Adjusted operating income 17,532 17,312 16,008
As Reported | Corporate/ Other      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total revenues 530 721 426
Adjusted operating income (1,785) (1,471) (1,306)
As Reported | Intersegment Eliminations      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total revenues (45,302) (43,923) (40,323)
Adjusted operating income (728) (711) (708)
As Reported | Health Care Benefits | Operating Segments      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total revenues 91,409 82,186 75,467
Adjusted operating income 5,984 5,012 6,188
As Reported | Health Services | Operating Segments      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total revenues 169,236 153,022 141,938
Adjusted operating income 7,356 6,859 5,688
As Reported | Pharmacy & Consumer Wellness | Operating Segments      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total revenues 106,594 100,105 91,198
Adjusted operating income 6,705 7,623 6,146
Adjustments      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total revenues 0 0 0
Adjusted operating income 505 (85) (52)
Adjustments | Corporate/ Other      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total revenues 0 0 0
Adjusted operating income 172 (164) (13)
Adjustments | Intersegment Eliminations      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total revenues (2,283) (2,318) (1,739)
Adjusted operating income 728 711 708
Adjustments | Health Care Benefits | Operating Segments      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total revenues (59) (67) (58)
Adjusted operating income 354 98 (53)
Adjustments | Health Services | Operating Segments      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total revenues 340 870 (584)
Adjusted operating income (575) (367) (560)
Adjustments | Pharmacy & Consumer Wellness | Operating Segments      
Segment Reporting, Other Significant Reconciling Item [Line Items]      
Total revenues 2,002 1,515 2,381
Adjusted operating income $ (174) $ (363) $ (134)