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Segment Financial Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Statement [Line Items]        
Premiums, revenues - unaffiliated customers $ 77,442 $ 72,339 $ 232,327 $ 217,599
Investment and other income 1,643 997 3,651 2,910
Total revenues 100,820 92,361 299,471 277,195
Earnings from operations 8,708 8,526 24,514 24,669
Interest expense (1,074) (834) (2,903) (2,416)
Loss on sale of subsidiary and subsidiaries held for sale (20) 0 (8,331) 0
Earnings before income taxes 7,614 7,692 13,280 22,253
Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 12,631 10,354 36,751 31,272
Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 9,104 8,671 26,742 25,414
Optum        
Statement [Line Items]        
Investment and other income 836 403 1,781 1,261
Total revenues 63,925 56,737 187,856 167,140
Earnings from operations 4,496 3,934 11,903 11,376
Interest expense 0 0 0 0
Loss on sale of subsidiary and subsidiaries held for sale 0   0  
Earnings before income taxes 4,496 3,934 11,903 11,376
Unaffiliated Customers        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 77,442 72,339 232,327 217,599
Total revenues 99,177 91,364 295,820 274,285
Unaffiliated Customers | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 12,631 10,354 36,751 31,272
Unaffiliated Customers | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 9,104 8,671 26,742 25,414
Unaffiliated Customers | Optum        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 5,818 5,630 17,460 16,385
Total revenues 25,131 22,105 73,614 65,382
Unaffiliated Customers | Optum | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 12,631 10,354 36,751 31,272
Unaffiliated Customers | Optum | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 6,682 6,121 19,403 17,725
Affiliated Customers        
Statement [Line Items]        
Total revenues 0 0 0 0
Affiliated Customers | Optum        
Statement [Line Items]        
Total revenues 37,958 34,229 112,461 100,497
Operating Segments | UnitedHealthcare        
Statement [Line Items]        
Investment and other income 807 594 1,870 1,649
Total revenues 74,853 69,853 224,076 210,552
Earnings from operations 4,212 4,592 12,611 13,293
Interest expense 0 0 0 0
Loss on sale of subsidiary and subsidiaries held for sale (20)   (8,331)  
Earnings before income taxes 4,192 4,592 4,280 13,293
Operating Segments | Optum Health        
Statement [Line Items]        
Investment and other income 614 317 1,386 1,038
Total revenues 25,917 23,864 79,698 70,785
Earnings from operations 2,161 1,568 5,979 4,869
Interest expense 0 0 0 0
Loss on sale of subsidiary and subsidiaries held for sale 0   0  
Earnings before income taxes 2,161 1,568 5,979 4,869
Operating Segments | Optum Insight        
Statement [Line Items]        
Investment and other income 104 35 159 80
Total revenues 4,931 4,977 13,976 14,147
Earnings from operations 791 1,109 1,827 2,984
Interest expense 0 0 0 0
Loss on sale of subsidiary and subsidiaries held for sale 0   0  
Earnings before income taxes 791 1,109 1,827 2,984
Operating Segments | Optum Rx        
Statement [Line Items]        
Investment and other income 118 51 236 143
Total revenues 34,207 28,857 97,457 84,921
Earnings from operations 1,544 1,257 4,097 3,523
Interest expense 0 0 0 0
Loss on sale of subsidiary and subsidiaries held for sale 0   0  
Earnings before income taxes 1,544 1,257 4,097 3,523
Operating Segments | Unaffiliated Customers | UnitedHealthcare        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 71,624 66,709 214,867 201,214
Total revenues 74,046 69,259 222,206 208,903
Operating Segments | Unaffiliated Customers | UnitedHealthcare | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 0 0 0 0
Operating Segments | Unaffiliated Customers | UnitedHealthcare | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 2,422 2,550 7,339 7,689
Operating Segments | Unaffiliated Customers | Optum Health        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 5,818 5,630 17,460 16,385
Total revenues 9,855 9,320 29,671 26,800
Operating Segments | Unaffiliated Customers | Optum Health | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 84 61 205 156
Operating Segments | Unaffiliated Customers | Optum Health | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 3,953 3,629 12,006 10,259
Operating Segments | Unaffiliated Customers | Optum Insight        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 0 0 0 0
Total revenues 1,741 1,978 4,930 5,978
Operating Segments | Unaffiliated Customers | Optum Insight | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 41 40 123 119
Operating Segments | Unaffiliated Customers | Optum Insight | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 1,700 1,938 4,807 5,859
Operating Segments | Unaffiliated Customers | Optum Rx        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 0 0 0 0
Total revenues 13,535 10,807 39,013 32,604
Operating Segments | Unaffiliated Customers | Optum Rx | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 12,506 10,253 36,423 30,997
Operating Segments | Unaffiliated Customers | Optum Rx | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 1,029 554 2,590 1,607
Operating Segments | Affiliated Customers | UnitedHealthcare        
Statement [Line Items]        
Total revenues 0 0 0 0
Operating Segments | Affiliated Customers | Optum Health        
Statement [Line Items]        
Total revenues 15,448 14,227 48,641 42,947
Operating Segments | Affiliated Customers | Optum Insight        
Statement [Line Items]        
Total revenues 3,086 2,964 8,887 8,089
Operating Segments | Affiliated Customers | Optum Rx        
Statement [Line Items]        
Total revenues 20,554 17,999 58,208 52,174
Optum Eliminations        
Statement [Line Items]        
Investment and other income 0 0 0 0
Total revenues (1,130) (961) (3,275) (2,713)
Earnings from operations 0 0 0 0
Interest expense 0 0 0 0
Loss on sale of subsidiary and subsidiaries held for sale 0   0  
Earnings before income taxes 0 0 0 0
Optum Eliminations | Unaffiliated Customers        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 0 0 0 0
Total revenues 0 0 0 0
Optum Eliminations | Unaffiliated Customers | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 0 0 0 0
Optum Eliminations | Unaffiliated Customers | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 0 0 0 0
Optum Eliminations | Affiliated Customers        
Statement [Line Items]        
Total revenues (1,130) (961) (3,275) (2,713)
Corporate and Eliminations        
Statement [Line Items]        
Investment and other income 0 0 0 0
Total revenues (37,958) (34,229) (112,461) (100,497)
Earnings from operations 0 0 0 0
Interest expense (1,074) (834) (2,903) (2,416)
Loss on sale of subsidiary and subsidiaries held for sale 0   0  
Earnings before income taxes (1,074) (834) (2,903) (2,416)
Corporate and Eliminations | Unaffiliated Customers        
Statement [Line Items]        
Premiums, revenues - unaffiliated customers 0 0 0 0
Total revenues 0 0 0 0
Corporate and Eliminations | Unaffiliated Customers | Products        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 0 0 0 0
Corporate and Eliminations | Unaffiliated Customers | Services        
Statement [Line Items]        
Revenue from Products and Services - unaffiliated customers 0 0 0 0
Corporate and Eliminations | Affiliated Customers        
Statement [Line Items]        
Total revenues $ (37,958) $ (34,229) $ (112,461) $ (100,497)