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Segment Financial Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Statement [Line Items]      
Premiums, revenues - unaffiliated customers $ 290,827 $ 257,157 $ 226,233
Investment and other income 4,089 2,030 2,324
Total revenues 371,622 324,162 287,597
Earnings from operations 32,358 28,435 23,970
Interest expense (3,246) (2,092) (1,660)
Earnings before income taxes 29,112 26,343 22,310
Total assets 273,720 245,705 212,206
Segment, Expenditure, Addition to Long-Lived Assets 3,386 2,802 2,454
Depreciation and amortization 3,972 3,400 3,103
Products      
Statement [Line Items]      
Revenue from Products and Services - unaffiliated customers 42,583 37,424 34,437
Services      
Statement [Line Items]      
Revenue from Products and Services - unaffiliated customers 34,123 27,551 24,603
Optum      
Statement [Line Items]      
Investment and other income 1,838 1,107 1,467
Total revenues 226,635 182,768 155,565
Earnings from operations 15,943 14,056 11,995
Interest expense 0 0 0
Earnings before income taxes 15,943 14,056 11,995
Total assets 174,871 147,516 117,523
Segment, Expenditure, Addition to Long-Lived Assets 2,520 2,003 1,659
Depreciation and amortization 2,983 2,427 2,099
Unaffiliated Customers      
Statement [Line Items]      
Premiums, revenues - unaffiliated customers 290,827 257,157 226,233
Total revenues 367,533 322,132 285,273
Unaffiliated Customers | Products      
Statement [Line Items]      
Revenue from Products and Services - unaffiliated customers 42,583 37,424 34,437
Unaffiliated Customers | Services      
Statement [Line Items]      
Revenue from Products and Services - unaffiliated customers 34,123 27,551 24,603
Unaffiliated Customers | Optum      
Statement [Line Items]      
Premiums, revenues - unaffiliated customers 21,775 18,374 13,852
Total revenues 88,424 73,314 63,231
Unaffiliated Customers | Optum | Products      
Statement [Line Items]      
Revenue from Products and Services - unaffiliated customers 42,583 37,424 34,437
Unaffiliated Customers | Optum | Services      
Statement [Line Items]      
Revenue from Products and Services - unaffiliated customers 24,066 17,516 14,942
Affiliated Customers      
Statement [Line Items]      
Total revenues 0 0 0
Affiliated Customers | Optum      
Statement [Line Items]      
Total revenues 136,373 108,347 90,867
Operating Segments | UnitedHealthcare      
Statement [Line Items]      
Investment and other income 2,251 923 857
Total revenues 281,360 249,741 222,899
Earnings from operations 16,415 14,379 11,975
Interest expense 0 0 0
Earnings before income taxes 16,415 14,379 11,975
Total assets 110,943 107,094 102,967
Segment, Expenditure, Addition to Long-Lived Assets 866 799 795
Depreciation and amortization 989 973 1,004
Operating Segments | Optum Health      
Statement [Line Items]      
Investment and other income 1,532 928 1,053
Total revenues 95,319 71,174 54,065
Earnings from operations 6,560 6,032 4,462
Interest expense 0 0 0
Earnings before income taxes 6,560 6,032 4,462
Total assets 89,432 68,950 60,474
Segment, Expenditure, Addition to Long-Lived Assets 1,199 997 791
Depreciation and amortization 1,058 943 818
Operating Segments | Optum Insight      
Statement [Line Items]      
Investment and other income 114 117 237
Total revenues 18,932 14,581 12,199
Earnings from operations 4,268 3,588 3,398
Interest expense 0 0 0
Earnings before income taxes 4,268 3,588 3,398
Total assets 34,173 31,090 16,868
Segment, Expenditure, Addition to Long-Lived Assets 974 698 567
Depreciation and amortization 1,229 841 684
Operating Segments | Optum Rx      
Statement [Line Items]      
Investment and other income 192 62 177
Total revenues 116,087 99,773 91,314
Earnings from operations 5,115 4,436 4,135
Interest expense 0 0 0
Earnings before income taxes 5,115 4,436 4,135
Total assets 51,266 47,476 40,181
Segment, Expenditure, Addition to Long-Lived Assets 347 308 301
Depreciation and amortization 696 643 597
Operating Segments | Unaffiliated Customers | UnitedHealthcare      
Statement [Line Items]      
Premiums, revenues - unaffiliated customers 269,052 238,783 212,381
Total revenues 279,109 248,818 222,042
Operating Segments | Unaffiliated Customers | UnitedHealthcare | Products      
Statement [Line Items]      
Revenue from Products and Services - unaffiliated customers 0 0 0
Operating Segments | Unaffiliated Customers | UnitedHealthcare | Services      
Statement [Line Items]      
Revenue from Products and Services - unaffiliated customers 10,057 10,035 9,661
Operating Segments | Unaffiliated Customers | Optum Health      
Statement [Line Items]      
Premiums, revenues - unaffiliated customers 21,775 18,374 13,852
Total revenues 36,091 29,363 23,778
Operating Segments | Unaffiliated Customers | Optum Health | Products      
Statement [Line Items]      
Revenue from Products and Services - unaffiliated customers 207 72 32
Operating Segments | Unaffiliated Customers | Optum Health | Services      
Statement [Line Items]      
Revenue from Products and Services - unaffiliated customers 14,109 10,917 9,894
Operating Segments | Unaffiliated Customers | Optum Insight      
Statement [Line Items]      
Premiums, revenues - unaffiliated customers 0 0 0
Total revenues 7,922 5,176 4,095
Operating Segments | Unaffiliated Customers | Optum Insight | Products      
Statement [Line Items]      
Revenue from Products and Services - unaffiliated customers 162 180 159
Operating Segments | Unaffiliated Customers | Optum Insight | Services      
Statement [Line Items]      
Revenue from Products and Services - unaffiliated customers 7,760 4,996 3,936
Operating Segments | Unaffiliated Customers | Optum Rx      
Statement [Line Items]      
Premiums, revenues - unaffiliated customers 0 0 0
Total revenues 44,411 38,775 35,358
Operating Segments | Unaffiliated Customers | Optum Rx | Products      
Statement [Line Items]      
Revenue from Products and Services - unaffiliated customers 42,214 37,172 34,246
Operating Segments | Unaffiliated Customers | Optum Rx | Services      
Statement [Line Items]      
Revenue from Products and Services - unaffiliated customers 2,197 1,603 1,112
Operating Segments | Affiliated Customers | UnitedHealthcare      
Statement [Line Items]      
Total revenues 0 0 0
Operating Segments | Affiliated Customers | Optum Health      
Statement [Line Items]      
Total revenues 57,696 40,883 29,234
Operating Segments | Affiliated Customers | Optum Insight      
Statement [Line Items]      
Total revenues 10,896 9,288 7,867
Operating Segments | Affiliated Customers | Optum Rx      
Statement [Line Items]      
Total revenues 71,484 60,936 55,779
Optum Eliminations      
Statement [Line Items]      
Investment and other income 0 0 0
Total revenues (3,703) (2,760) (2,013)
Earnings from operations 0 0 0
Interest expense 0 0 0
Earnings before income taxes 0 0 0
Total assets 0 0 0
Segment, Expenditure, Addition to Long-Lived Assets 0 0 0
Depreciation and amortization 0 0 0
Optum Eliminations | Unaffiliated Customers      
Statement [Line Items]      
Premiums, revenues - unaffiliated customers 0 0 0
Total revenues 0 0 0
Optum Eliminations | Unaffiliated Customers | Products      
Statement [Line Items]      
Revenue from Products and Services - unaffiliated customers 0 0 0
Optum Eliminations | Unaffiliated Customers | Services      
Statement [Line Items]      
Revenue from Products and Services - unaffiliated customers 0 0 0
Optum Eliminations | Affiliated Customers      
Statement [Line Items]      
Total revenues (3,703) (2,760) (2,013)
Corporate and Eliminations      
Statement [Line Items]      
Investment and other income 0 0 0
Total revenues (136,373) (108,347) (90,867)
Earnings from operations 0 0 0
Interest expense (3,246) (2,092) (1,660)
Earnings before income taxes (3,246) (2,092) (1,660)
Total assets (12,094) (8,905) (8,284)
Segment, Expenditure, Addition to Long-Lived Assets 0 0 0
Depreciation and amortization 0 0 0
Corporate and Eliminations | Unaffiliated Customers      
Statement [Line Items]      
Premiums, revenues - unaffiliated customers 0 0 0
Total revenues 0 0 0
Corporate and Eliminations | Unaffiliated Customers | Products      
Statement [Line Items]      
Revenue from Products and Services - unaffiliated customers 0 0 0
Corporate and Eliminations | Unaffiliated Customers | Services      
Statement [Line Items]      
Revenue from Products and Services - unaffiliated customers 0 0 0
Corporate and Eliminations | Affiliated Customers      
Statement [Line Items]      
Total revenues $ (136,373) $ (108,347) $ (90,867)