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Significant Accounting Policies - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation of Revenue [Line Items]        
Revenues $ 72,327 $ 65,157 $ 141,127 $ 131,750
Net investment income 289 184 586 346
Total revenues 72,616 65,341 141,713 132,096
Pharmacy        
Disaggregation of Revenue [Line Items]        
Revenues 45,932 41,774 88,884 83,646
Front Store        
Disaggregation of Revenue [Line Items]        
Revenues 5,254 4,653 9,896 9,861
Premiums        
Disaggregation of Revenue [Line Items]        
Revenues 18,983 16,927 37,943 34,567
Other        
Disaggregation of Revenue [Line Items]        
Revenues 2,158 1,803 4,404 3,676
Health Care Benefits        
Disaggregation of Revenue [Line Items]        
Total revenues 20,525 18,468 41,008 37,666
Pharmacy Services        
Disaggregation of Revenue [Line Items]        
Total revenues 38,314 34,889 74,635 69,872
Retail/ LTC        
Disaggregation of Revenue [Line Items]        
Total revenues 24,728 21,662 48,002 44,411
Operating Segments | Health Care Benefits        
Disaggregation of Revenue [Line Items]        
Revenues 20,367 18,318 40,682 37,415
Net investment income 137 127 285 220
Total revenues 20,525 18,468 41,008 37,666
Operating Segments | Health Care Benefits | Pharmacy        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
Operating Segments | Health Care Benefits | Front Store        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
Operating Segments | Health Care Benefits | Premiums        
Disaggregation of Revenue [Line Items]        
Revenues 18,968 16,913 37,910 34,534
Operating Segments | Health Care Benefits | Other        
Disaggregation of Revenue [Line Items]        
Revenues 1,420 1,428 2,813 2,912
Operating Segments | Pharmacy Services        
Disaggregation of Revenue [Line Items]        
Revenues 35,745 32,623 69,058 64,741
Net investment income 0 0 0 0
Total revenues 38,314 34,889 74,635 69,872
Operating Segments | Pharmacy Services | Pharmacy network        
Disaggregation of Revenue [Line Items]        
Total revenues 22,918 20,536 44,811 41,636
Operating Segments | Pharmacy Services | Mail choice        
Disaggregation of Revenue [Line Items]        
Total revenues 15,235 14,109 29,483 27,783
Operating Segments | Pharmacy Services | Other        
Disaggregation of Revenue [Line Items]        
Total revenues 161 244 341 453
Operating Segments | Pharmacy Services | Pharmacy        
Disaggregation of Revenue [Line Items]        
Revenues 38,153 34,645 74,294 69,419
Operating Segments | Pharmacy Services | Front Store        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
Operating Segments | Pharmacy Services | Premiums        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
Operating Segments | Pharmacy Services | Other        
Disaggregation of Revenue [Line Items]        
Revenues 161 244 341 453
Operating Segments | Retail/ LTC        
Disaggregation of Revenue [Line Items]        
Revenues 16,185 14,187 31,325 29,544
Net investment income 0 0 46 0
Total revenues 24,728 21,662 48,002 44,411
Operating Segments | Retail/ LTC | Pharmacy        
Disaggregation of Revenue [Line Items]        
Revenues 18,873 16,870 36,758 34,225
Operating Segments | Retail/ LTC | Front Store        
Disaggregation of Revenue [Line Items]        
Revenues 5,254 4,653 9,896 9,861
Operating Segments | Retail/ LTC | Premiums        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
Operating Segments | Retail/ LTC | Other        
Disaggregation of Revenue [Line Items]        
Revenues 601 139 1,302 325
Corporate/ Other        
Disaggregation of Revenue [Line Items]        
Revenues 30 29 62 50
Net investment income 152 57 255 126
Total revenues 182 86 317 176
Corporate/ Other | Pharmacy        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
Corporate/ Other | Front Store        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
Corporate/ Other | Premiums        
Disaggregation of Revenue [Line Items]        
Revenues 15 14 33 33
Corporate/ Other | Other        
Disaggregation of Revenue [Line Items]        
Revenues 15 15 29 17
Intersegment Eliminations        
Disaggregation of Revenue [Line Items]        
Net investment income 0 0 0 0
Total revenues (11,133) (9,764) (22,249) (20,029)
Intersegment Eliminations | Pharmacy        
Disaggregation of Revenue [Line Items]        
Revenues (11,094) (9,741) (22,168) (19,998)
Intersegment Eliminations | Front Store        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
Intersegment Eliminations | Premiums        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
Intersegment Eliminations | Other        
Disaggregation of Revenue [Line Items]        
Revenues $ (39) $ (23) $ (81) $ (31)