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Segment Financial Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Statement [Line Items]        
Premiums, revenues - unaffiliated customers $ 72,474 $ 63,896 $ 145,260 $ 127,966
Investment and other income 1,115 295 1,913 662
Total revenues 92,903 80,332 184,834 160,481
Earnings from operations 8,057 7,132 16,143 14,082
Interest expense (828) (467) (1,582) (900)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 7,229 6,665 14,561 13,182
Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 10,651 9,496 20,918 18,836
Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 8,663 6,645 16,743 13,017
Optum        
Statement [Line Items]        
Investment and other income 515 100 858 324
Total revenues 56,344 45,082 110,403 88,341
Earnings from operations 3,699 3,282 7,442 6,434
Interest expense 0 0 0 0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 3,699 3,282 7,442 6,434
Unaffiliated Customers        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 72,474 63,896 145,260 127,966
Total revenues 91,788 80,037 182,921 159,819
Unaffiliated Customers | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 10,651 9,496 20,918 18,836
Unaffiliated Customers | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 8,663 6,645 16,743 13,017
Unaffiliated Customers | Optum        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 5,427 4,528 10,755 8,661
Total revenues 22,157 18,127 43,277 35,457
Unaffiliated Customers | Optum | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 10,651 9,496 20,918 18,836
Unaffiliated Customers | Optum | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 6,079 4,103 11,604 7,960
Affiliated Customers        
Statement [Line Items]        
Total revenues 0 0 0 0
Affiliated Customers | Optum        
Statement [Line Items]        
Total revenues 33,672 26,855 66,268 52,560
Operating Segments | UnitedHealthcare        
Statement [Line Items]        
Investment and other income 600 195 1,055 338
Total revenues 70,231 62,105 140,699 124,700
Earnings from operations 4,358 3,850 8,701 7,648
Interest expense 0 0 0 0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 4,358 3,850 8,701 7,648
Operating Segments | Optum Health        
Statement [Line Items]        
Investment and other income 444 85 721 241
Total revenues 23,917 17,583 46,921 34,265
Earnings from operations 1,525 1,399 3,301 2,765
Interest expense 0 0 0 0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 1,525 1,399 3,301 2,765
Operating Segments | Optum Insight        
Statement [Line Items]        
Investment and other income 25 9 45 76
Total revenues 4,674 3,282 9,170 6,501
Earnings from operations 968 839 1,875 1,686
Interest expense 0 0 0 0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 968 839 1,875 1,686
Operating Segments | Optum Rx        
Statement [Line Items]        
Investment and other income 46 6 92 7
Total revenues 28,646 24,805 56,064 48,716
Earnings from operations 1,206 1,044 2,266 1,983
Interest expense 0 0 0 0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 1,206 1,044 2,266 1,983
Operating Segments | Unaffiliated Customers | UnitedHealthcare        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 67,047 59,368 134,505 119,305
Total revenues 69,631 61,910 139,644 124,362
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 2,584 2,542 5,139 5,057
Operating Segments | Unaffiliated Customers | Optum Health        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 5,427 4,528 10,755 8,661
Total revenues 9,019 7,274 17,480 13,971
Operating Segments | Unaffiliated Customers | Optum Health | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 51 6 95 12
Operating Segments | Unaffiliated Customers | Optum Health | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 3,541 2,740 6,630 5,298
Operating Segments | Unaffiliated Customers | Optum Insight        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 0 0 0 0
Total revenues 2,034 1,092 4,000 2,106
Operating Segments | Unaffiliated Customers | Optum Insight | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 39 58 79 98
Operating Segments | Unaffiliated Customers | Optum Insight | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 1,995 1,034 3,921 2,008
Operating Segments | Unaffiliated Customers | Optum Rx        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 0 0 0 0
Total revenues 11,104 9,761 21,797 19,380
Operating Segments | Unaffiliated Customers | Optum Rx | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 10,561 9,432 20,744 18,726
Operating Segments | Unaffiliated Customers | Optum Rx | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 543 329 1,053 654
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 14,454 10,224 28,720 20,053
Operating Segments | Affiliated Customers | Optum Insight        
Statement [Line Items]        
Total revenues 2,615 2,181 5,125 4,319
Operating Segments | Affiliated Customers | Optum Rx        
Statement [Line Items]        
Total revenues 17,496 15,038 34,175 29,329
Optum Eliminations        
Statement [Line Items]        
Investment and other income 0 0 0 0
Total revenues (893) (588) (1,752) (1,141)
Earnings from operations 0 0 0 0
Interest expense 0 0 0 0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 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 (893) (588) (1,752) (1,141)
Corporate and Eliminations        
Statement [Line Items]        
Investment and other income 0 0 0 0
Total revenues (33,672) (26,855) (66,268) (52,560)
Earnings from operations 0 0 0 0
Interest expense (828) (467) (1,582) (900)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest (828) (467) (1,582) (900)
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 $ (33,672) $ (26,855) $ (66,268) $ (52,560)