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Segment Financial Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Statement [Line Items]        
Premiums, revenues - unaffiliated customers $ 76,897 $ 72,474 $ 154,885 $ 145,260
Investment and other income 997 1,115 2,008 1,913
Total revenues 98,855 92,903 198,651 184,834
Earnings from operations 7,875 8,057 15,806 16,143
Interest expense (985) (828) (1,829) (1,582)
Loss on sale of subsidiary and subsidiaries held for sale (1,225) 0 (8,311) 0
Earnings before income taxes 5,665 7,229 5,666 14,561
Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 12,211 10,651 24,120 20,918
Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 8,750 8,663 17,638 16,743
Optum        
Statement [Line Items]        
Investment and other income 469 515 945 858
Total revenues 62,879 56,344 123,931 110,403
Earnings from operations 3,871 3,699 7,407 7,442
Interest expense 0 0 0 0
Loss on sale of subsidiary and subsidiaries held for sale 0   0  
Earnings before income taxes 3,871 3,699 7,407 7,442
Unaffiliated Customers        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 76,897 72,474 154,885 145,260
Total revenues 97,858 91,788 196,643 182,921
Unaffiliated Customers | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 12,211 10,651 24,120 20,918
Unaffiliated Customers | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 8,750 8,663 17,638 16,743
Unaffiliated Customers | Optum        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 5,947 5,427 11,642 10,755
Total revenues 24,520 22,157 48,483 43,277
Unaffiliated Customers | Optum | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 12,211 10,651 24,120 20,918
Unaffiliated Customers | Optum | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 6,362 6,079 12,721 11,604
Affiliated Customers        
Statement [Line Items]        
Total revenues 0 0 0 0
Affiliated Customers | Optum        
Statement [Line Items]        
Total revenues 37,890 33,672 74,503 66,268
Operating Segments | UnitedHealthcare        
Statement [Line Items]        
Investment and other income 528 600 1,063 1,055
Total revenues 73,866 70,231 149,223 140,699
Earnings from operations 4,004 4,358 8,399 8,701
Interest expense 0 0 0 0
Loss on sale of subsidiary and subsidiaries held for sale (1,225)   (8,311)  
Earnings before income taxes 2,779 4,358 88 8,701
Operating Segments | Optum Health        
Statement [Line Items]        
Investment and other income 382 444 772 721
Total revenues 27,050 23,917 53,781 46,921
Earnings from operations 1,919 1,525 3,818 3,301
Interest expense 0 0 0 0
Loss on sale of subsidiary and subsidiaries held for sale 0   0  
Earnings before income taxes 1,919 1,525 3,818 3,301
Operating Segments | Optum Insight        
Statement [Line Items]        
Investment and other income 27 25 55 45
Total revenues 4,543 4,674 9,045 9,170
Earnings from operations 546 968 1,036 1,875
Interest expense 0 0 0 0
Loss on sale of subsidiary and subsidiaries held for sale 0   0  
Earnings before income taxes 546 968 1,036 1,875
Operating Segments | Optum Rx        
Statement [Line Items]        
Investment and other income 60 46 118 92
Total revenues 32,415 28,646 63,250 56,064
Earnings from operations 1,406 1,206 2,553 2,266
Interest expense 0 0 0 0
Loss on sale of subsidiary and subsidiaries held for sale 0   0  
Earnings before income taxes 1,406 1,206 2,553 2,266
Operating Segments | Unaffiliated Customers | UnitedHealthcare        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 70,950 67,047 143,243 134,505
Total revenues 73,338 69,631 148,160 139,644
Operating Segments | Unaffiliated Customers | UnitedHealthcare | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 0 0 0 0
Operating Segments | Unaffiliated Customers | UnitedHealthcare | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 2,388 2,584 4,917 5,139
Operating Segments | Unaffiliated Customers | Optum Health        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 5,947 5,427 11,642 10,755
Total revenues 10,092 9,019 19,816 17,480
Operating Segments | Unaffiliated Customers | Optum Health | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 62 51 121 95
Operating Segments | Unaffiliated Customers | Optum Health | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 4,083 3,541 8,053 6,630
Operating Segments | Unaffiliated Customers | Optum Insight        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 0 0 0 0
Total revenues 1,446 2,034 3,189 4,000
Operating Segments | Unaffiliated Customers | Optum Insight | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 41 39 82 79
Operating Segments | Unaffiliated Customers | Optum Insight | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 1,405 1,995 3,107 3,921
Operating Segments | Unaffiliated Customers | Optum Rx        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 0 0 0 0
Total revenues 12,982 11,104 25,478 21,797
Operating Segments | Unaffiliated Customers | Optum Rx | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 12,108 10,561 23,917 20,744
Operating Segments | Unaffiliated Customers | Optum Rx | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 874 543 1,561 1,053
Operating Segments | Affiliated Customers | UnitedHealthcare        
Statement [Line Items]        
Total revenues 0 0 0 0
Operating Segments | Affiliated Customers | Optum Health        
Statement [Line Items]        
Total revenues 16,576 14,454 33,193 28,720
Operating Segments | Affiliated Customers | Optum Insight        
Statement [Line Items]        
Total revenues 3,070 2,615 5,801 5,125
Operating Segments | Affiliated Customers | Optum Rx        
Statement [Line Items]        
Total revenues 19,373 17,496 37,654 34,175
Optum Eliminations        
Statement [Line Items]        
Investment and other income 0 0 0 0
Total revenues (1,129) (893) (2,145) (1,752)
Earnings from operations 0 0 0 0
Interest expense 0 0 0 0
Loss on sale of subsidiary and subsidiaries held for sale 0   0  
Earnings before income taxes 0 0 0 0
Optum Eliminations | Unaffiliated Customers        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 0 0 0 0
Total revenues 0 0 0 0
Optum Eliminations | Unaffiliated Customers | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 0 0 0 0
Optum Eliminations | Unaffiliated Customers | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 0 0 0 0
Optum Eliminations | Affiliated Customers        
Statement [Line Items]        
Total revenues (1,129) (893) (2,145) (1,752)
Corporate and Eliminations        
Statement [Line Items]        
Investment and other income 0 0 0 0
Total revenues (37,890) (33,672) (74,503) (66,268)
Earnings from operations 0 0 0 0
Interest expense (985) (828) (1,829) (1,582)
Loss on sale of subsidiary and subsidiaries held for sale 0   0  
Earnings before income taxes (985) (828) (1,829) (1,582)
Corporate and Eliminations | Unaffiliated Customers        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 0 0 0 0
Total revenues 0 0 0 0
Corporate and Eliminations | Unaffiliated Customers | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 0 0 0 0
Corporate and Eliminations | Unaffiliated Customers | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 0 0 0 0
Corporate and Eliminations | Affiliated Customers        
Statement [Line Items]        
Total revenues $ (37,890) $ (33,672) $ (74,503) $ (66,268)