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Segment Financial Information (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Statement [Line Items]    
Premiums, revenues - unaffiliated customers $ 72,786 $ 64,070
Investment and other income 798 367
Total revenues 91,931 80,149
Earnings from operations 8,086 6,950
Interest expense (754) (433)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 7,332 6,517
Products    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 10,267 9,340
Services    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 8,080 6,372
Optum    
Statement [Line Items]    
Investment and other income 343 224
Total revenues 54,059 43,259
Earnings from operations 3,743 3,152
Interest expense 0 0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 3,743 3,152
Unaffiliated Customers    
Statement [Line Items]    
Premiums, revenues - unaffiliated customers 72,786 64,070
Total revenues 91,133 79,782
Unaffiliated Customers | Products    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 10,267 9,340
Unaffiliated Customers | Services    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 8,080 6,372
Unaffiliated Customers | Optum    
Statement [Line Items]    
Premiums, revenues - unaffiliated customers 5,328 4,133
Total revenues 21,120 17,330
Unaffiliated Customers | Optum | Products    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 10,267 9,340
Unaffiliated Customers | Optum | Services    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 5,525 3,857
Affiliated Customers    
Statement [Line Items]    
Total revenues 0 0
Affiliated Customers | Optum    
Statement [Line Items]    
Total revenues 32,596 25,705
Operating Segments | UnitedHealthcare    
Statement [Line Items]    
Investment and other income 455 143
Total revenues 70,468 62,595
Earnings from operations 4,343 3,798
Interest expense 0 0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 4,343 3,798
Operating Segments | Optum Health    
Statement [Line Items]    
Investment and other income 277 156
Total revenues 23,004 16,682
Earnings from operations 1,776 1,366
Interest expense 0 0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 1,776 1,366
Operating Segments | Optum Insight    
Statement [Line Items]    
Investment and other income 20 67
Total revenues 4,496 3,219
Earnings from operations 907 847
Interest expense 0 0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 907 847
Operating Segments | Optum Rx    
Statement [Line Items]    
Investment and other income 46 1
Total revenues 27,418 23,911
Earnings from operations 1,060 939
Interest expense 0 0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 1,060 939
Operating Segments | Unaffiliated Customers | UnitedHealthcare    
Statement [Line Items]    
Premiums, revenues - unaffiliated customers 67,458 59,937
Total revenues 70,013 62,452
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 2,555 2,515
Operating Segments | Unaffiliated Customers | Optum Health    
Statement [Line Items]    
Premiums, revenues - unaffiliated customers 5,328 4,133
Total revenues 8,461 6,697
Operating Segments | Unaffiliated Customers | Optum Health | Products    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 44 6
Operating Segments | Unaffiliated Customers | Optum Health | Services    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 3,089 2,558
Operating Segments | Unaffiliated Customers | Optum Insight    
Statement [Line Items]    
Premiums, revenues - unaffiliated customers 0 0
Total revenues 1,966 1,014
Operating Segments | Unaffiliated Customers | Optum Insight | Products    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 40 40
Operating Segments | Unaffiliated Customers | Optum Insight | Services    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 1,926 974
Operating Segments | Unaffiliated Customers | Optum Rx    
Statement [Line Items]    
Premiums, revenues - unaffiliated customers 0 0
Total revenues 10,693 9,619
Operating Segments | Unaffiliated Customers | Optum Rx | Products    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 10,183 9,294
Operating Segments | Unaffiliated Customers | Optum Rx | Services    
Statement [Line Items]    
Revenue from Products and Services - unaffiliated customers 510 325
Operating Segments | Affiliated Customers | UnitedHealthcare    
Statement [Line Items]    
Total revenues 0 0
Operating Segments | Affiliated Customers | Optum Health    
Statement [Line Items]    
Total revenues 14,266 9,829
Operating Segments | Affiliated Customers | Optum Insight    
Statement [Line Items]    
Total revenues 2,510 2,138
Operating Segments | Affiliated Customers | Optum Rx    
Statement [Line Items]    
Total revenues 16,679 14,291
Optum Eliminations    
Statement [Line Items]    
Investment and other income 0 0
Total revenues (859) (553)
Earnings from operations 0 0
Interest expense 0 0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 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 (859) (553)
Corporate and Eliminations    
Statement [Line Items]    
Investment and other income 0 0
Total revenues (32,596) (25,705)
Earnings from operations 0 0
Interest expense (754) (433)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest (754) (433)
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 $ (32,596) $ (25,705)