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Segment Financial Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Statement [Line Items]        
Premiums, revenues - unaffiliated customers $ 63,896 $ 56,233 $ 127,966 $ 111,719
Investment and other income 295 556 662 1,008
Total revenues 80,332 71,321 160,481 141,517
Earnings from operations 7,132 5,978 14,082 12,717
Interest expense (467) (410) (900) (807)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 6,665 5,568 13,182 11,910
Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 9,496 8,433 18,836 16,773
Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 6,645 6,099 13,017 12,017
Optum        
Statement [Line Items]        
Investment and other income 100 380 324 626
Total revenues 45,082 38,303 88,341 74,687
Earnings from operations 3,282 2,883 6,434 5,514
Interest expense 0 0 0 0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 3,282 2,883 6,434 5,514
Unaffiliated Customers        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 63,896 56,233 127,966 111,719
Total revenues 80,037 70,765 159,819 140,509
Unaffiliated Customers | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 9,496 8,433 18,836 16,773
Unaffiliated Customers | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 6,645 6,099 13,017 12,017
Unaffiliated Customers | Optum        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 4,528 3,375 8,661 6,303
Total revenues 18,127 15,467 35,457 30,303
Unaffiliated Customers | Optum | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 9,496 8,433 18,836 16,773
Unaffiliated Customers | Optum | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 4,103 3,659 7,960 7,227
Affiliated Customers        
Statement [Line Items]        
Total revenues 0 0 0 0
Affiliated Customers | Optum        
Statement [Line Items]        
Total revenues 26,855 22,456 52,560 43,758
Operating Segments | UnitedHealthcare        
Statement [Line Items]        
Investment and other income 195 176 338 382
Total revenues 62,105 55,474 124,700 110,588
Earnings from operations 3,850 3,095 7,648 7,203
Interest expense 0 0 0 0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 3,850 3,095 7,648 7,203
Operating Segments | OptumHealth        
Statement [Line Items]        
Investment and other income 85 234 241 413
Total revenues 17,583 13,300 34,265 25,703
Earnings from operations 1,399 1,128 2,765 2,090
Interest expense 0 0 0 0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 1,399 1,128 2,765 2,090
Operating Segments | OptumInsight        
Statement [Line Items]        
Investment and other income 9 73 76 106
Total revenues 3,282 2,957 6,501 5,809
Earnings from operations 839 762 1,686 1,541
Interest expense 0 0 0 0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 839 762 1,686 1,541
Operating Segments | OptumRx        
Statement [Line Items]        
Investment and other income 6 73 7 107
Total revenues 24,805 22,524 48,716 44,128
Earnings from operations 1,044 993 1,983 1,883
Interest expense 0 0 0 0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 1,044 993 1,983 1,883
Operating Segments | Unaffiliated Customers | UnitedHealthcare        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 59,368 52,858 119,305 105,416
Total revenues 61,910 55,298 124,362 110,206
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 2,542 2,440 5,057 4,790
Operating Segments | Unaffiliated Customers | OptumHealth        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 4,528 3,375 8,661 6,303
Total revenues 7,274 5,845 13,971 11,117
Operating Segments | Unaffiliated Customers | OptumHealth | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 6 9 12 17
Operating Segments | Unaffiliated Customers | OptumHealth | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 2,740 2,461 5,298 4,797
Operating Segments | Unaffiliated Customers | OptumInsight        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 0 0 0 0
Total revenues 1,092 963 2,106 1,961
Operating Segments | Unaffiliated Customers | OptumInsight | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 58 33 98 70
Operating Segments | Unaffiliated Customers | OptumInsight | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 1,034 930 2,008 1,891
Operating Segments | Unaffiliated Customers | OptumRx        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 0 0 0 0
Total revenues 9,761 8,659 19,380 17,225
Operating Segments | Unaffiliated Customers | OptumRx | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 9,432 8,391 18,726 16,686
Operating Segments | Unaffiliated Customers | OptumRx | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 329 268 654 539
Operating Segments | Affiliated Customers | UnitedHealthcare        
Statement [Line Items]        
Total revenues 0 0 0 0
Operating Segments | Affiliated Customers | OptumHealth        
Statement [Line Items]        
Total revenues 10,224 7,221 20,053 14,173
Operating Segments | Affiliated Customers | OptumInsight        
Statement [Line Items]        
Total revenues 2,181 1,921 4,319 3,742
Operating Segments | Affiliated Customers | OptumRx        
Statement [Line Items]        
Total revenues 15,038 13,792 29,329 26,796
Optum Eliminations        
Statement [Line Items]        
Investment and other income 0 0 0 0
Total revenues (588) (478) (1,141) (953)
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 (588) (478) (1,141) (953)
Corporate and Eliminations        
Statement [Line Items]        
Investment and other income 0 0 0 0
Total revenues (26,855) (22,456) (52,560) (43,758)
Earnings from operations 0 0 0 0
Interest expense (467) (410) (900) (807)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest (467) (410) (900) (807)
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 $ (26,855) $ (22,456) $ (52,560) $ (43,758)