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Segment Financial Information (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Statement [Line Items]    
Premiums, revenues - unaffiliated customers $ 77,988 $ 72,786
Investment and other income 1,011 798
Total revenues 99,796 91,931
Earnings from operations 7,931 8,086
Interest expense (844) (754)
Loss on sale of subsidiary (7,086) 0
Earnings before income taxes 1 7,332
Products    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 11,909 10,267
Services    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 8,888 8,080
Optum    
Statement [Line Items]    
Investment and other income 476 343
Total revenues 61,052 54,059
Earnings from operations 3,536 3,743
Interest expense 0 0
Loss on sale of subsidiary 0  
Earnings before income taxes 3,536 3,743
Unaffiliated Customers    
Statement [Line Items]    
Premiums, revenues - unaffiliated customers 77,988 72,786
Total revenues 98,785 91,133
Unaffiliated Customers | Products    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 11,909 10,267
Unaffiliated Customers | Services    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 8,888 8,080
Unaffiliated Customers | Optum    
Statement [Line Items]    
Premiums, revenues - unaffiliated customers 5,695 5,328
Total revenues 23,963 21,120
Unaffiliated Customers | Optum | Products    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 11,909 10,267
Unaffiliated Customers | Optum | Services    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 6,359 5,525
Affiliated Customers    
Statement [Line Items]    
Total revenues 0 0
Affiliated Customers | Optum    
Statement [Line Items]    
Total revenues 36,613 32,596
Operating Segments | UnitedHealthcare    
Statement [Line Items]    
Investment and other income 535 455
Total revenues 75,357 70,468
Earnings from operations 4,395 4,343
Interest expense 0 0
Loss on sale of subsidiary (7,086)  
Earnings before income taxes (2,691) 4,343
Operating Segments | Optum Health    
Statement [Line Items]    
Investment and other income 390 277
Total revenues 26,731 23,004
Earnings from operations 1,899 1,776
Interest expense 0 0
Loss on sale of subsidiary 0  
Earnings before income taxes 1,899 1,776
Operating Segments | Optum Insight    
Statement [Line Items]    
Investment and other income 28 20
Total revenues 4,502 4,496
Earnings from operations 490 907
Interest expense 0 0
Loss on sale of subsidiary 0  
Earnings before income taxes 490 907
Operating Segments | Optum Rx    
Statement [Line Items]    
Investment and other income 58 46
Total revenues 30,835 27,418
Earnings from operations 1,147 1,060
Interest expense 0 0
Loss on sale of subsidiary 0  
Earnings before income taxes 1,147 1,060
Operating Segments | Unaffiliated Customers | UnitedHealthcare    
Statement [Line Items]    
Premiums, revenues - unaffiliated customers 72,293 67,458
Total revenues 74,822 70,013
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 2,529 2,555
Operating Segments | Unaffiliated Customers | Optum Health    
Statement [Line Items]    
Premiums, revenues - unaffiliated customers 5,695 5,328
Total revenues 9,724 8,461
Operating Segments | Unaffiliated Customers | Optum Health | Products    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 59 44
Operating Segments | Unaffiliated Customers | Optum Health | Services    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 3,970 3,089
Operating Segments | Unaffiliated Customers | Optum Insight    
Statement [Line Items]    
Premiums, revenues - unaffiliated customers 0 0
Total revenues 1,743 1,966
Operating Segments | Unaffiliated Customers | Optum Insight | Products    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 41 40
Operating Segments | Unaffiliated Customers | Optum Insight | Services    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 1,702 1,926
Operating Segments | Unaffiliated Customers | Optum Rx    
Statement [Line Items]    
Premiums, revenues - unaffiliated customers 0 0
Total revenues 12,496 10,693
Operating Segments | Unaffiliated Customers | Optum Rx | Products    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 11,809 10,183
Operating Segments | Unaffiliated Customers | Optum Rx | Services    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 687 510
Operating Segments | Affiliated Customers | UnitedHealthcare    
Statement [Line Items]    
Total revenues 0 0
Operating Segments | Affiliated Customers | Optum Health    
Statement [Line Items]    
Total revenues 16,617 14,266
Operating Segments | Affiliated Customers | Optum Insight    
Statement [Line Items]    
Total revenues 2,731 2,510
Operating Segments | Affiliated Customers | Optum Rx    
Statement [Line Items]    
Total revenues 18,281 16,679
Optum Eliminations    
Statement [Line Items]    
Investment and other income 0 0
Total revenues (1,016) (859)
Earnings from operations 0 0
Interest expense 0 0
Loss on sale of subsidiary 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 (1,016) (859)
Corporate and Eliminations    
Statement [Line Items]    
Investment and other income 0 0
Total revenues (36,613) (32,596)
Earnings from operations 0 0
Interest expense (844) (754)
Loss on sale of subsidiary 0  
Earnings before income taxes (844) (754)
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 $ (36,613) $ (32,596)