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Segment Financial Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Statement [Line Items]        
Premiums, revenues - unaffiliated customers $ 50,863 $ 47,397 $ 150,897 $ 142,074
Products 8,777 7,546 25,455 23,971
Services 5,124 4,942 14,265 13,756
Investment and other income 351 466 1,057 1,453
Total revenues 65,115 60,351 191,674 181,254
Earnings from operations 4,651 5,014 18,888 14,590
Interest expense (395) (449) (1,262) (1,267)
Earnings before income taxes 4,256 4,565 17,626 13,323
Optum        
Statement [Line Items]        
Investment and other income 174 192 510 549
Total revenues 34,923 28,763 100,457 83,152
Earnings from operations 2,583 2,359 6,925 6,339
Interest expense 0 0 0 0
Earnings before income taxes 2,583 2,359 6,925 6,339
Unaffiliated Customers        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 50,863 47,397 150,897 142,074
Products 8,777 7,546 25,455 23,971
Services 5,124 4,942 14,265 13,756
Total revenues 64,764 59,885 190,617 179,801
Unaffiliated Customers | Optum        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 2,742 1,840 7,144 3,986
Products 8,777 7,546 25,455 23,971
Services 3,049 2,668 8,017 7,153
Total revenues 14,568 12,054 40,616 35,110
Affiliated Customers        
Statement [Line Items]        
Total revenues 0 0 0 0
Affiliated Customers | Optum        
Statement [Line Items]        
Total revenues 20,181 16,517 59,331 47,493
Operating Segments | UnitedHealthcare        
Statement [Line Items]        
Investment and other income 177 274 547 904
Total revenues 50,373 48,105 150,548 145,595
Earnings from operations 2,068 2,655 11,963 8,251
Interest expense 0 0 0 0
Earnings before income taxes 2,068 2,655 11,963 8,251
Operating Segments | OptumHealth        
Statement [Line Items]        
Investment and other income 165 170 430 488
Total revenues 10,499 8,133 28,830 21,994
Earnings from operations 835 748 2,388 2,062
Interest expense 0 0 0 0
Earnings before income taxes 835 748 2,388 2,062
Operating Segments | OptumInsight        
Statement [Line Items]        
Investment and other income 4 6 34 17
Total revenues 2,767 2,617 7,893 7,145
Earnings from operations 785 632 1,882 1,589
Interest expense 0 0 0 0
Earnings before income taxes 785 632 1,882 1,589
Operating Segments | OptumRx        
Statement [Line Items]        
Investment and other income 5 16 46 44
Total revenues 22,081 18,454 65,009 55,194
Earnings from operations 963 979 2,655 2,688
Interest expense 0 0 0 0
Earnings before income taxes 963 979 2,655 2,688
Operating Segments | Unaffiliated Customers | UnitedHealthcare        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 48,121 45,557 143,753 138,088
Products 0 0 0 0
Services 2,075 2,274 6,248 6,603
Total revenues 50,196 47,831 150,001 144,691
Operating Segments | Unaffiliated Customers | OptumHealth        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 2,742 1,840 7,144 3,986
Products 10 6 26 23
Services 1,834 1,487 4,607 4,131
Total revenues 4,586 3,333 11,777 8,140
Operating Segments | Unaffiliated Customers | OptumInsight        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 0 0 0 0
Products 34 29 90 74
Services 974 988 2,629 2,532
Total revenues 1,008 1,017 2,719 2,606
Operating Segments | Unaffiliated Customers | OptumRx        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 0 0 0 0
Products 8,733 7,511 25,339 23,874
Services 241 193 781 490
Total revenues 8,974 7,704 26,120 24,364
Operating Segments | Affiliated Customers | UnitedHealthcare        
Statement [Line Items]        
Total revenues 0 0 0 0
Operating Segments | Affiliated Customers | OptumHealth        
Statement [Line Items]        
Total revenues 5,748 4,630 16,623 13,366
Operating Segments | Affiliated Customers | OptumInsight        
Statement [Line Items]        
Total revenues 1,755 1,594 5,140 4,522
Operating Segments | Affiliated Customers | OptumRx        
Statement [Line Items]        
Total revenues 13,102 10,734 38,843 30,786
Optum Eliminations        
Statement [Line Items]        
Investment and other income 0 0 0 0
Total revenues (424) (441) (1,275) (1,181)
Earnings from operations 0 0 0 0
Interest expense 0 0 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
Products 0 0 0 0
Services 0 0 0 0
Total revenues 0 0 0 0
Optum Eliminations | Affiliated Customers        
Statement [Line Items]        
Total revenues (424) (441) (1,275) (1,181)
Corporate and Eliminations        
Statement [Line Items]        
Investment and other income 0 0 0 0
Total revenues (20,181) (16,517) (59,331) (47,493)
Earnings from operations 0 0 0 0
Interest expense (395) (449) (1,262) (1,267)
Earnings before income taxes (395) (449) (1,262) (1,267)
Corporate and Eliminations | Unaffiliated Customers        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 0 0 0 0
Products 0 0 0 0
Services 0 0 0 0
Total revenues 0 0 0 0
Corporate and Eliminations | Affiliated Customers        
Statement [Line Items]        
Total revenues $ (20,181) $ (16,517) $ (59,331) $ (47,493)