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Segment Financial Information (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Statement [Line Items]    
Premiums, revenues - unaffiliated customers $ 55,486 $ 50,640
Investment and other income 452 365
Total revenues 70,196 64,421
Earnings from operations 6,739 4,996
Interest expense (397) (437)
Earnings before income taxes 6,342 4,559
Products    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 8,340 8,431
Services    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 5,918 4,985
Optum    
Statement [Line Items]    
Investment and other income 246 168
Total revenues 36,384 32,839
Earnings from operations 2,631 2,108
Interest expense 0 0
Earnings before income taxes 2,631 2,108
Unaffiliated Customers    
Statement [Line Items]    
Premiums, revenues - unaffiliated customers 55,486 50,640
Total revenues 69,744 64,056
Unaffiliated Customers | Products    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 8,340 8,431
Unaffiliated Customers | Services    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 5,918 4,985
Unaffiliated Customers | Optum    
Statement [Line Items]    
Premiums, revenues - unaffiliated customers 2,928 2,047
Total revenues 14,836 13,185
Unaffiliated Customers | Optum | Products    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 8,340 8,431
Unaffiliated Customers | Optum | Services    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 3,568 2,707
Affiliated Customers    
Statement [Line Items]    
Total revenues 0 0
Affiliated Customers | Optum    
Statement [Line Items]    
Total revenues 21,302 19,486
Operating Segments | UnitedHealthcare    
Statement [Line Items]    
Investment and other income 206 197
Total revenues 55,114 51,068
Earnings from operations 4,108 2,888
Interest expense 0 0
Earnings before income taxes 4,108 2,888
Operating Segments | OptumHealth    
Statement [Line Items]    
Investment and other income 179 136
Total revenues 12,403 9,192
Earnings from operations 962 712
Interest expense 0 0
Earnings before income taxes 962 712
Operating Segments | OptumInsight    
Statement [Line Items]    
Investment and other income 33 12
Total revenues 2,852 2,494
Earnings from operations 779 536
Interest expense 0 0
Earnings before income taxes 779 536
Operating Segments | OptumRx    
Statement [Line Items]    
Investment and other income 34 20
Total revenues 21,604 21,557
Earnings from operations 890 860
Interest expense 0 0
Earnings before income taxes 890 860
Operating Segments | Unaffiliated Customers | UnitedHealthcare    
Statement [Line Items]    
Premiums, revenues - unaffiliated customers 52,558 48,593
Total revenues 54,908 50,871
Operating Segments | Unaffiliated Customers | UnitedHealthcare | Products    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 0 0
Operating Segments | Unaffiliated Customers | UnitedHealthcare | Services    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 2,350 2,278
Operating Segments | Unaffiliated Customers | OptumHealth    
Statement [Line Items]    
Premiums, revenues - unaffiliated customers 2,928 2,047
Total revenues 5,272 3,604
Operating Segments | Unaffiliated Customers | OptumHealth | Products    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 8 9
Operating Segments | Unaffiliated Customers | OptumHealth | Services    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 2,336 1,548
Operating Segments | Unaffiliated Customers | OptumInsight    
Statement [Line Items]    
Premiums, revenues - unaffiliated customers 0 0
Total revenues 998 920
Operating Segments | Unaffiliated Customers | OptumInsight | Products    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 37 29
Operating Segments | Unaffiliated Customers | OptumInsight | Services    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 961 891
Operating Segments | Unaffiliated Customers | OptumRx    
Statement [Line Items]    
Premiums, revenues - unaffiliated customers 0 0
Total revenues 8,566 8,661
Operating Segments | Unaffiliated Customers | OptumRx | Products    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 8,295 8,393
Operating Segments | Unaffiliated Customers | OptumRx | Services    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 271 268
Operating Segments | Affiliated Customers | UnitedHealthcare    
Statement [Line Items]    
Total revenues 0 0
Operating Segments | Affiliated Customers | OptumHealth    
Statement [Line Items]    
Total revenues 6,952 5,452
Operating Segments | Affiliated Customers | OptumInsight    
Statement [Line Items]    
Total revenues 1,821 1,562
Operating Segments | Affiliated Customers | OptumRx    
Statement [Line Items]    
Total revenues 13,004 12,876
Optum Eliminations    
Statement [Line Items]    
Investment and other income 0 0
Total revenues (475) (404)
Earnings from operations 0 0
Interest expense 0 0
Earnings before income taxes 0 0
Optum Eliminations | Unaffiliated Customers    
Statement [Line Items]    
Premiums, revenues - unaffiliated customers 0 0
Total revenues 0 0
Optum Eliminations | Unaffiliated Customers | Products    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 0 0
Optum Eliminations | Unaffiliated Customers | Services    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 0 0
Optum Eliminations | Affiliated Customers    
Statement [Line Items]    
Total revenues (475) (404)
Corporate and Eliminations    
Statement [Line Items]    
Investment and other income 0 0
Total revenues (21,302) (19,486)
Earnings from operations 0 0
Interest expense (397) (437)
Earnings before income taxes (397) (437)
Corporate and Eliminations | Unaffiliated Customers    
Statement [Line Items]    
Premiums, revenues - unaffiliated customers 0 0
Total revenues 0 0
Corporate and Eliminations | Unaffiliated Customers | Products    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 0 0
Corporate and Eliminations | Unaffiliated Customers | Services    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 0 0
Corporate and Eliminations | Affiliated Customers    
Statement [Line Items]    
Total revenues $ (21,302) $ (19,486)