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Segment Financial Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Statement [Line Items]        
Premiums, revenues - unaffiliated customers $ 64,491 $ 56,967 $ 192,457 $ 168,686
Investment and other income 513 503 1,175 1,511
Total revenues 80,894 72,337 241,375 213,854
Earnings from operations 7,462 5,712 21,544 18,429
Interest expense (516) (422) (1,416) (1,229)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 6,946 5,290 20,128 17,200
Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 9,190 8,703 28,026 25,476
Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 6,700 6,164 19,717 18,181
Optum        
Statement [Line Items]        
Investment and other income 328 328 652 954
Total revenues 46,559 39,785 134,900 114,472
Earnings from operations 3,663 3,061 10,097 8,575
Interest expense 0 0 0 0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 3,663 3,061 10,097 8,575
Unaffiliated Customers        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 64,491 56,967 192,457 168,686
Total revenues 80,381 71,834 240,200 212,343
Unaffiliated Customers | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 9,190 8,703 28,026 25,476
Unaffiliated Customers | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 6,700 6,164 19,717 18,181
Unaffiliated Customers | Optum        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 5,116 3,622 13,777 9,925
Total revenues 18,571 16,082 54,028 46,385
Unaffiliated Customers | Optum | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 9,190 8,703 28,026 25,476
Unaffiliated Customers | Optum | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 4,265 3,757 12,225 10,984
Affiliated Customers        
Statement [Line Items]        
Total revenues 0 0 0 0
Affiliated Customers | Optum        
Statement [Line Items]        
Total revenues 27,660 23,375 80,220 67,133
Operating Segments | UnitedHealthcare        
Statement [Line Items]        
Investment and other income 185 175 523 557
Total revenues 61,995 55,927 186,695 166,515
Earnings from operations 3,799 2,651 11,447 9,854
Interest expense 0 0 0 0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 3,799 2,651 11,447 9,854
Operating Segments | OptumHealth        
Statement [Line Items]        
Investment and other income 287 226 528 639
Total revenues 18,463 13,812 52,728 39,515
Earnings from operations 1,575 1,143 4,340 3,233
Interest expense 0 0 0 0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 1,575 1,143 4,340 3,233
Operating Segments | OptumInsight        
Statement [Line Items]        
Investment and other income 23 95 99 201
Total revenues 3,693 3,139 10,194 8,948
Earnings from operations 1,007 906 2,693 2,447
Interest expense 0 0 0 0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 1,007 906 2,693 2,447
Operating Segments | OptumRx        
Statement [Line Items]        
Investment and other income 18 7 25 114
Total revenues 25,203 23,337 73,919 67,465
Earnings from operations 1,081 1,012 3,064 2,895
Interest expense 0 0 0 0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 1,081 1,012 3,064 2,895
Operating Segments | Unaffiliated Customers | UnitedHealthcare        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 59,375 53,345 178,680 158,761
Total revenues 61,810 55,752 186,172 165,958
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 2,435 2,407 7,492 7,197
Operating Segments | Unaffiliated Customers | OptumHealth        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 5,116 3,622 13,777 9,925
Total revenues 7,874 6,145 21,845 17,262
Operating Segments | Unaffiliated Customers | OptumHealth | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 2 8 14 25
Operating Segments | Unaffiliated Customers | OptumHealth | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 2,756 2,515 8,054 7,312
Operating Segments | Unaffiliated Customers | OptumInsight        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 0 0 0 0
Total revenues 1,104 1,007 3,210 2,968
Operating Segments | Unaffiliated Customers | OptumInsight | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 37 37 135 107
Operating Segments | Unaffiliated Customers | OptumInsight | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 1,067 970 3,075 2,861
Operating Segments | Unaffiliated Customers | OptumRx        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 0 0 0 0
Total revenues 9,593 8,930 28,973 26,155
Operating Segments | Unaffiliated Customers | OptumRx | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 9,151 8,658 27,877 25,344
Operating Segments | Unaffiliated Customers | OptumRx | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 442 272 1,096 811
Operating Segments | Affiliated Customers | UnitedHealthcare        
Statement [Line Items]        
Total revenues 0 0 0 0
Operating Segments | Affiliated Customers | OptumHealth        
Statement [Line Items]        
Total revenues 10,302 7,441 30,355 21,614
Operating Segments | Affiliated Customers | OptumInsight        
Statement [Line Items]        
Total revenues 2,566 2,037 6,885 5,779
Operating Segments | Affiliated Customers | OptumRx        
Statement [Line Items]        
Total revenues 15,592 14,400 44,921 41,196
Optum Eliminations        
Statement [Line Items]        
Investment and other income 0 0 0 0
Total revenues (800) (503) (1,941) (1,456)
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 (800) (503) (1,941) (1,456)
Corporate and Eliminations        
Statement [Line Items]        
Investment and other income 0 0 0 0
Total revenues (27,660) (23,375) (80,220) (67,133)
Earnings from operations 0 0 0 0
Interest expense (516) (422) (1,416) (1,229)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest (516) (422) (1,416) (1,229)
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 $ (27,660) $ (23,375) $ (80,220) $ (67,133)