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Segment Financial Information (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Statement [Line Items]    
Premiums, revenues - unaffiliated customers $ 64,070 $ 55,486
Investment and other income 367 452
Total revenues 80,149 70,196
Earnings from operations 6,950 6,739
Interest expense (433) (397)
Earnings before income taxes 6,517 6,342
Products    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 9,340 8,340
Services    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 6,372 5,918
Optum    
Statement [Line Items]    
Investment and other income 224 246
Total revenues 43,259 36,384
Earnings from operations 3,152 2,631
Interest expense 0 0
Earnings before income taxes 3,152 2,631
Unaffiliated Customers    
Statement [Line Items]    
Premiums, revenues - unaffiliated customers 64,070 55,486
Total revenues 79,782 69,744
Unaffiliated Customers | Products    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 9,340 8,340
Unaffiliated Customers | Services    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 6,372 5,918
Unaffiliated Customers | Optum    
Statement [Line Items]    
Premiums, revenues - unaffiliated customers 4,133 2,928
Total revenues 17,330 14,836
Unaffiliated Customers | Optum | Products    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 9,340 8,340
Unaffiliated Customers | Optum | Services    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 3,857 3,568
Affiliated Customers    
Statement [Line Items]    
Total revenues 0 0
Affiliated Customers | Optum    
Statement [Line Items]    
Total revenues 25,705 21,302
Operating Segments | UnitedHealthcare    
Statement [Line Items]    
Investment and other income 143 206
Total revenues 62,595 55,114
Earnings from operations 3,798 4,108
Interest expense 0 0
Earnings before income taxes 3,798 4,108
Operating Segments | OptumHealth    
Statement [Line Items]    
Investment and other income 156 179
Total revenues 16,682 12,403
Earnings from operations 1,366 962
Interest expense 0 0
Earnings before income taxes 1,366 962
Operating Segments | OptumInsight    
Statement [Line Items]    
Investment and other income 67 33
Total revenues 3,219 2,852
Earnings from operations 847 779
Interest expense 0 0
Earnings before income taxes 847 779
Operating Segments | OptumRx    
Statement [Line Items]    
Investment and other income 1 34
Total revenues 23,911 21,604
Earnings from operations 939 890
Interest expense 0 0
Earnings before income taxes 939 890
Operating Segments | Unaffiliated Customers | UnitedHealthcare    
Statement [Line Items]    
Premiums, revenues - unaffiliated customers 59,937 52,558
Total revenues 62,452 54,908
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 2,515 2,350
Operating Segments | Unaffiliated Customers | OptumHealth    
Statement [Line Items]    
Premiums, revenues - unaffiliated customers 4,133 2,928
Total revenues 6,697 5,272
Operating Segments | Unaffiliated Customers | OptumHealth | Products    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 6 8
Operating Segments | Unaffiliated Customers | OptumHealth | Services    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 2,558 2,336
Operating Segments | Unaffiliated Customers | OptumInsight    
Statement [Line Items]    
Premiums, revenues - unaffiliated customers 0 0
Total revenues 1,014 998
Operating Segments | Unaffiliated Customers | OptumInsight | Products    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 40 37
Operating Segments | Unaffiliated Customers | OptumInsight | Services    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 974 961
Operating Segments | Unaffiliated Customers | OptumRx    
Statement [Line Items]    
Premiums, revenues - unaffiliated customers 0 0
Total revenues 9,619 8,566
Operating Segments | Unaffiliated Customers | OptumRx | Products    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 9,294 8,295
Operating Segments | Unaffiliated Customers | OptumRx | Services    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 325 271
Operating Segments | Affiliated Customers | UnitedHealthcare    
Statement [Line Items]    
Total revenues 0 0
Operating Segments | Affiliated Customers | OptumHealth    
Statement [Line Items]    
Total revenues 9,829 6,952
Operating Segments | Affiliated Customers | OptumInsight    
Statement [Line Items]    
Total revenues 2,138 1,821
Operating Segments | Affiliated Customers | OptumRx    
Statement [Line Items]    
Total revenues 14,291 13,004
Optum Eliminations    
Statement [Line Items]    
Investment and other income 0 0
Total revenues (553) (475)
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 (553) (475)
Corporate and Eliminations    
Statement [Line Items]    
Investment and other income 0 0
Total revenues (25,705) (21,302)
Earnings from operations 0 0
Interest expense (433) (397)
Earnings before income taxes (433) (397)
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 $ (25,705) $ (21,302)