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Segment Financial Information (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Statement [Line Items]      
Premiums, revenues - unaffiliated customers $ 86,534 $ 77,988  
Investment and other income 1,033 1,011  
Total revenues 109,575 99,796  
Total operating costs 100,456 91,865  
Earnings from operations 9,119 7,931  
Interest expense (998) (844)  
Loss on sale of subsidiary and subsidiaries held for sale (15) (7,086)  
Earnings before income taxes 8,106 1  
Total assets 309,790 284,210 $ 298,278
Purchases of property, equipment and capitalized software 898 743  
Depreciation and amortization 1,061 997  
Products      
Statement [Line Items]      
Revenue from Products and Services - unaffiliated customers 13,036 11,909  
Services      
Statement [Line Items]      
Revenue from Products and Services - unaffiliated customers 8,972 8,888  
Optum      
Statement [Line Items]      
Investment and other income 505 476  
Total revenues 63,885 61,052  
Total operating costs 59,992 57,516  
Earnings from operations 3,893 3,536  
Interest expense 0 0  
Loss on sale of subsidiary and subsidiaries held for sale 0    
Earnings before income taxes 3,893 3,536  
Total assets 192,571 184,372  
Purchases of property, equipment and capitalized software 702 560  
Depreciation and amortization 842 762  
Unaffiliated Customers      
Statement [Line Items]      
Premiums, revenues - unaffiliated customers 86,534 77,988  
Total revenues 108,542 98,785  
Unaffiliated Customers | Products      
Statement [Line Items]      
Revenue from Products and Services - unaffiliated customers 13,036 11,909  
Unaffiliated Customers | Services      
Statement [Line Items]      
Revenue from Products and Services - unaffiliated customers 8,972 8,888  
Unaffiliated Customers | Optum      
Statement [Line Items]      
Premiums, revenues - unaffiliated customers 5,021 5,695  
Total revenues 24,453 23,963  
Unaffiliated Customers | Optum | Products      
Statement [Line Items]      
Revenue from Products and Services - unaffiliated customers 13,036 11,909  
Unaffiliated Customers | Optum | Services      
Statement [Line Items]      
Revenue from Products and Services - unaffiliated customers 6,396 6,359  
Affiliated Customers      
Statement [Line Items]      
Total revenues 0 0  
Affiliated Customers | Optum      
Statement [Line Items]      
Total revenues 38,927 36,613  
Operating Segments | UnitedHealthcare      
Statement [Line Items]      
Investment and other income 528 535  
Total revenues 84,617 75,357  
Total operating costs 79,391 70,962  
Earnings from operations 5,226 4,395  
Interest expense 0 0  
Loss on sale of subsidiary and subsidiaries held for sale (15) (7,086)  
Earnings before income taxes 5,211 (2,691)  
Total assets 131,902 112,840  
Purchases of property, equipment and capitalized software 196 183  
Depreciation and amortization 219 235  
Operating Segments | Optum      
Statement [Line Items]      
Loss on sale of subsidiary and subsidiaries held for sale   0  
Operating Segments | Optum Health      
Statement [Line Items]      
Investment and other income 435 390  
Total revenues 25,309 26,731  
Total operating costs 23,695 24,832  
Earnings from operations 1,614 1,899  
Interest expense 0 0  
Loss on sale of subsidiary and subsidiaries held for sale 0 0  
Earnings before income taxes 1,614 1,899  
Total assets 97,722 94,861  
Purchases of property, equipment and capitalized software 279 238  
Depreciation and amortization 287 272  
Operating Segments | Optum Insight      
Statement [Line Items]      
Investment and other income 23 28  
Total revenues 4,630 4,502  
Total operating costs 3,669 4,012  
Earnings from operations 961 490  
Interest expense 0 0  
Loss on sale of subsidiary and subsidiaries held for sale 0 0  
Earnings before income taxes 961 490  
Total assets 34,470 34,220  
Purchases of property, equipment and capitalized software 338 245  
Depreciation and amortization 344 310  
Operating Segments | Optum Rx      
Statement [Line Items]      
Investment and other income 47 58  
Total revenues 35,132 30,835  
Total operating costs 33,814 29,688  
Earnings from operations 1,318 1,147  
Interest expense 0 0  
Loss on sale of subsidiary and subsidiaries held for sale 0 0  
Earnings before income taxes 1,318 1,147  
Total assets 60,379 55,291  
Purchases of property, equipment and capitalized software 85 77  
Depreciation and amortization 211 180  
Operating Segments | Unaffiliated Customers | UnitedHealthcare      
Statement [Line Items]      
Premiums, revenues - unaffiliated customers 81,513 72,293  
Total revenues 84,089 74,822  
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 2,576 2,529  
Operating Segments | Unaffiliated Customers | Optum Health      
Statement [Line Items]      
Premiums, revenues - unaffiliated customers 5,021 5,695  
Total revenues 8,960 9,724  
Operating Segments | Unaffiliated Customers | Optum Health | Products      
Statement [Line Items]      
Revenue from Products and Services - unaffiliated customers 65 59  
Operating Segments | Unaffiliated Customers | Optum Health | Services      
Statement [Line Items]      
Revenue from Products and Services - unaffiliated customers 3,874 3,970  
Operating Segments | Unaffiliated Customers | Optum Insight      
Statement [Line Items]      
Premiums, revenues - unaffiliated customers 0 0  
Total revenues 1,545 1,743  
Operating Segments | Unaffiliated Customers | Optum Insight | Products      
Statement [Line Items]      
Revenue from Products and Services - unaffiliated customers 44 41  
Operating Segments | Unaffiliated Customers | Optum Insight | Services      
Statement [Line Items]      
Revenue from Products and Services - unaffiliated customers 1,501 1,702  
Operating Segments | Unaffiliated Customers | Optum Rx      
Statement [Line Items]      
Premiums, revenues - unaffiliated customers 0 0  
Total revenues 13,948 12,496  
Operating Segments | Unaffiliated Customers | Optum Rx | Products      
Statement [Line Items]      
Revenue from Products and Services - unaffiliated customers 12,927 11,809  
Operating Segments | Unaffiliated Customers | Optum Rx | Services      
Statement [Line Items]      
Revenue from Products and Services - unaffiliated customers 1,021 687  
Operating Segments | Affiliated Customers | UnitedHealthcare      
Statement [Line Items]      
Total revenues 0 0  
Operating Segments | Affiliated Customers | Optum Health      
Statement [Line Items]      
Total revenues 15,914 16,617  
Operating Segments | Affiliated Customers | Optum Insight      
Statement [Line Items]      
Total revenues 3,062 2,731  
Operating Segments | Affiliated Customers | Optum Rx      
Statement [Line Items]      
Total revenues 21,137 18,281  
Optum Eliminations      
Statement [Line Items]      
Investment and other income 0 0  
Total revenues (1,186) (1,016)  
Total operating costs (1,186) (1,016)  
Earnings from operations 0 0  
Interest expense 0 0  
Loss on sale of subsidiary and subsidiaries held for sale 0 0  
Earnings before income taxes 0 0  
Total assets 0 0  
Purchases of property, equipment and capitalized software 0 0  
Depreciation and amortization 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 (1,186) (1,016)  
Corporate and Eliminations      
Statement [Line Items]      
Investment and other income 0 0  
Total revenues (38,927) (36,613)  
Total operating costs (38,927) (36,613)  
Earnings from operations 0 0  
Interest expense (998) (844)  
Loss on sale of subsidiary and subsidiaries held for sale 0 0  
Earnings before income taxes (998) (844)  
Total assets (14,683) (13,002)  
Purchases of property, equipment and capitalized software 0 0  
Depreciation and amortization 0 0  
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 $ (38,927) $ (36,613)