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Segment Financial Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Statement [Line Items]        
Premiums, revenues - unaffiliated customers $ 56,967 $ 50,863 $ 168,686 $ 150,897
Investment and other income 503 351 1,511 1,057
Total revenues 72,337 65,115 213,854 191,674
Earnings from operations 5,712 4,651 18,429 18,888
Interest expense (422) (395) (1,229) (1,262)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 5,290 4,256 17,200 17,626
Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 8,703 8,777 25,476 25,455
Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 6,164 5,124 18,181 14,265
Optum        
Statement [Line Items]        
Investment and other income 328 174 954 510
Total revenues 39,785 34,923 114,472 100,457
Earnings from operations 3,061 2,583 8,575 6,925
Interest expense 0 0 0 0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 3,061 2,583 8,575 6,925
Unaffiliated Customers        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 56,967 50,863 168,686 150,897
Total revenues 71,834 64,764 212,343 190,617
Unaffiliated Customers | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 8,703 8,777 25,476 25,455
Unaffiliated Customers | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 6,164 5,124 18,181 14,265
Unaffiliated Customers | Optum        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 3,622 2,742 9,925 7,144
Total revenues 16,082 14,568 46,385 40,616
Unaffiliated Customers | Optum | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 8,703 8,777 25,476 25,455
Unaffiliated Customers | Optum | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 3,757 3,049 10,984 8,017
Affiliated Customers        
Statement [Line Items]        
Total revenues 0 0 0 0
Affiliated Customers | Optum        
Statement [Line Items]        
Total revenues 23,375 20,181 67,133 59,331
Operating Segments | UnitedHealthcare        
Statement [Line Items]        
Investment and other income 175 177 557 547
Total revenues 55,927 50,373 166,515 150,548
Earnings from operations 2,651 2,068 9,854 11,963
Interest expense 0 0 0 0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 2,651 2,068 9,854 11,963
Operating Segments | OptumHealth        
Statement [Line Items]        
Investment and other income 226 165 639 430
Total revenues 13,812 10,499 39,515 28,830
Earnings from operations 1,143 835 3,233 2,388
Interest expense 0 0 0 0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 1,143 835 3,233 2,388
Operating Segments | OptumInsight        
Statement [Line Items]        
Investment and other income 95 4 201 34
Total revenues 3,139 2,767 8,948 7,893
Earnings from operations 906 785 2,447 1,882
Interest expense 0 0 0 0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 906 785 2,447 1,882
Operating Segments | OptumRx        
Statement [Line Items]        
Investment and other income 7 5 114 46
Total revenues 23,337 22,081 67,465 65,009
Earnings from operations 1,012 963 2,895 2,655
Interest expense 0 0 0 0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 1,012 963 2,895 2,655
Operating Segments | Unaffiliated Customers | UnitedHealthcare        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 53,345 48,121 158,761 143,753
Total revenues 55,752 50,196 165,958 150,001
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 2,407 2,075 7,197 6,248
Operating Segments | Unaffiliated Customers | OptumHealth        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 3,622 2,742 9,925 7,144
Total revenues 6,145 4,586 17,262 11,777
Operating Segments | Unaffiliated Customers | OptumHealth | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 8 10 25 26
Operating Segments | Unaffiliated Customers | OptumHealth | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 2,515 1,834 7,312 4,607
Operating Segments | Unaffiliated Customers | OptumInsight        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 0 0 0 0
Total revenues 1,007 1,008 2,968 2,719
Operating Segments | Unaffiliated Customers | OptumInsight | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 37 34 107 90
Operating Segments | Unaffiliated Customers | OptumInsight | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 970 974 2,861 2,629
Operating Segments | Unaffiliated Customers | OptumRx        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 0 0 0 0
Total revenues 8,930 8,974 26,155 26,120
Operating Segments | Unaffiliated Customers | OptumRx | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 8,658 8,733 25,344 25,339
Operating Segments | Unaffiliated Customers | OptumRx | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 272 241 811 781
Operating Segments | Affiliated Customers | UnitedHealthcare        
Statement [Line Items]        
Total revenues 0 0 0 0
Operating Segments | Affiliated Customers | OptumHealth        
Statement [Line Items]        
Total revenues 7,441 5,748 21,614 16,623
Operating Segments | Affiliated Customers | OptumInsight        
Statement [Line Items]        
Total revenues 2,037 1,755 5,779 5,140
Operating Segments | Affiliated Customers | OptumRx        
Statement [Line Items]        
Total revenues 14,400 13,102 41,196 38,843
Optum Eliminations        
Statement [Line Items]        
Investment and other income 0 0 0 0
Total revenues (503) (424) (1,456) (1,275)
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 (503) (424) (1,456) (1,275)
Corporate and Eliminations        
Statement [Line Items]        
Investment and other income 0 0 0 0
Total revenues (23,375) (20,181) (67,133) (59,331)
Earnings from operations 0 0 0 0
Interest expense (422) (395) (1,229) (1,262)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest (422) (395) (1,229) (1,262)
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 $ (23,375) $ (20,181) $ (67,133) $ (59,331)