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Segment Financial Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Statement [Line Items]        
Premiums, revenues - unaffiliated customers $ 56,233 $ 49,394 $ 111,719 $ 100,034
Investment and other income 556 341 1,008 706
Total revenues 71,321 62,138 141,517 126,559
Earnings from operations 5,978 9,241 12,717 14,237
Interest expense (410) (430) (807) (867)
Earnings before income taxes 5,568 8,811 11,910 13,370
Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 8,433 8,247 16,773 16,678
Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 6,099 4,156 12,017 9,141
Optum        
Statement [Line Items]        
Investment and other income 380 168 626 336
Total revenues 38,303 32,695 74,687 65,534
Earnings from operations 2,883 2,234 5,514 4,342
Interest expense 0 0 0 0
Earnings before income taxes 2,883 2,234 5,514 4,342
Unaffiliated Customers        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 56,233 49,394 111,719 100,034
Total revenues 70,765 61,797 140,509 125,853
Unaffiliated Customers | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 8,433 8,247 16,773 16,678
Unaffiliated Customers | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 6,099 4,156 12,017 9,141
Unaffiliated Customers | Optum        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 3,375 2,355 6,303 4,402
Total revenues 15,467 12,863 30,303 26,048
Unaffiliated Customers | Optum | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 8,433 8,247 16,773 16,678
Unaffiliated Customers | Optum | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 3,659 2,261 7,227 4,968
Affiliated Customers        
Statement [Line Items]        
Total revenues 0 0 0 0
Affiliated Customers | Optum        
Statement [Line Items]        
Total revenues 22,456 19,664 43,758 39,150
Operating Segments | UnitedHealthcare        
Statement [Line Items]        
Investment and other income 176 173 382 370
Total revenues 55,474 49,107 110,588 100,175
Earnings from operations 3,095 7,007 7,203 9,895
Interest expense 0 0 0 0
Earnings before income taxes 3,095 7,007 7,203 9,895
Operating Segments | OptumHealth        
Statement [Line Items]        
Investment and other income 234 129 413 265
Total revenues 13,300 9,139 25,703 18,331
Earnings from operations 1,128 841 2,090 1,553
Interest expense 0 0 0 0
Earnings before income taxes 1,128 841 2,090 1,553
Operating Segments | OptumInsight        
Statement [Line Items]        
Investment and other income 73 18 106 30
Total revenues 2,957 2,632 5,809 5,126
Earnings from operations 762 561 1,541 1,097
Interest expense 0 0 0 0
Earnings before income taxes 762 561 1,541 1,097
Operating Segments | OptumRx        
Statement [Line Items]        
Investment and other income 73 21 107 41
Total revenues 22,524 21,371 44,128 42,928
Earnings from operations 993 832 1,883 1,692
Interest expense 0 0 0 0
Earnings before income taxes 993 832 1,883 1,692
Operating Segments | Unaffiliated Customers | UnitedHealthcare        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 52,858 47,039 105,416 95,632
Total revenues 55,298 48,934 110,206 99,805
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 2,440 1,895 4,790 4,173
Operating Segments | Unaffiliated Customers | OptumHealth        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 3,375 2,355 6,303 4,402
Total revenues 5,845 3,587 11,117 7,191
Operating Segments | Unaffiliated Customers | OptumHealth | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 9 7 17 16
Operating Segments | Unaffiliated Customers | OptumHealth | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 2,461 1,225 4,797 2,773
Operating Segments | Unaffiliated Customers | OptumInsight        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 0 0 0 0
Total revenues 963 791 1,961 1,711
Operating Segments | Unaffiliated Customers | OptumInsight | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 33 27 70 56
Operating Segments | Unaffiliated Customers | OptumInsight | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 930 764 1,891 1,655
Operating Segments | Unaffiliated Customers | OptumRx        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 0 0 0 0
Total revenues 8,659 8,485 17,225 17,146
Operating Segments | Unaffiliated Customers | OptumRx | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 8,391 8,213 16,686 16,606
Operating Segments | Unaffiliated Customers | OptumRx | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 268 272 539 540
Operating Segments | Affiliated Customers | UnitedHealthcare        
Statement [Line Items]        
Total revenues 0 0 0 0
Operating Segments | Affiliated Customers | OptumHealth        
Statement [Line Items]        
Total revenues 7,221 5,423 14,173 10,875
Operating Segments | Affiliated Customers | OptumInsight        
Statement [Line Items]        
Total revenues 1,921 1,823 3,742 3,385
Operating Segments | Affiliated Customers | OptumRx        
Statement [Line Items]        
Total revenues 13,792 12,865 26,796 25,741
Optum Eliminations        
Statement [Line Items]        
Investment and other income 0 0 0 0
Total revenues (478) (447) (953) (851)
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
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 (478) (447) (953) (851)
Corporate and Eliminations        
Statement [Line Items]        
Investment and other income 0 0 0 0
Total revenues (22,456) (19,664) (43,758) (39,150)
Earnings from operations 0 0 0 0
Interest expense (410) (430) (807) (867)
Earnings before income taxes (410) (430) (807) (867)
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 $ (22,456) $ (19,664) $ (43,758) $ (39,150)