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Segment Financial Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Statement [Line Items] |  |  |
Premiums, revenues - unaffiliated customers | $ 308,810 | $ 290,827 | $ 257,157
Investment and other income | 5,202 | 4,089 | 2,030
Total revenues | 400,278 | 371,622 | 324,162
Total operating costs | 367,991 | 339,264 | 295,727
Earnings from operations | 32,287 | 32,358 | 28,435
Interest expense | (3,906) | (3,246) | (2,092)
Loss on sale of subsidiary and subsidiaries held for sale | (8,310) | 0 | 0
Earnings before income taxes | 20,071 | 29,112 | 26,343
Total assets | 298,278 | 273,720 | 245,705
Segment, Expenditure, Addition to Long-Lived Assets | 3,499 | 3,386 | 2,802
Depreciation and amortization | 4,099 | 3,972 | 3,400
Products |  |  |
Statement [Line Items] |  |  |
Revenue from Products and Services - unaffiliated customers | 50,226 | 42,583 | 37,424
Services |  |  |
Statement [Line Items] |  |  |
Revenue from Products and Services - unaffiliated customers | 36,040 | 34,123 | 27,551
Optum |  |  |
Statement [Line Items] |  |  |
Investment and other income | 2,789 | 1,838 | 1,107
Total revenues | 252,957 | 226,635 | 182,768
Total operating costs | 236,254 | 210,692 | 168,712
Earnings from operations | 16,703 | 15,943 | 14,056
Interest expense | 0 | 0 | 0
Loss on sale of subsidiary and subsidiaries held for sale | 0 |  |
Earnings before income taxes | 16,703 | 15,943 | 14,056
Total assets | 190,010 | 174,871 | 147,516
Segment, Expenditure, Addition to Long-Lived Assets | 2,718 | 2,520 | 2,003
Depreciation and amortization | 3,210 | 2,983 | 2,427
Unaffiliated Customers |  |  |
Statement [Line Items] |  |  |
Premiums, revenues - unaffiliated customers | 308,810 | 290,827 | 257,157
Total revenues | 395,076 | 367,533 | 322,132
Unaffiliated Customers | Products |  |  |
Statement [Line Items] |  |  |
Revenue from Products and Services - unaffiliated customers | 50,226 | 42,583 | 37,424
Unaffiliated Customers | Services |  |  |
Statement [Line Items] |  |  |
Revenue from Products and Services - unaffiliated customers | 36,040 | 34,123 | 27,551
Unaffiliated Customers | Optum |  |  |
Statement [Line Items] |  |  |
Premiums, revenues - unaffiliated customers | 22,806 | 21,775 | 18,374
Total revenues | 99,281 | 88,424 | 73,314
Unaffiliated Customers | Optum | Products |  |  |
Statement [Line Items] |  |  |
Revenue from Products and Services - unaffiliated customers | 50,226 | 42,583 | 37,424
Unaffiliated Customers | Optum | Services |  |  |
Statement [Line Items] |  |  |
Revenue from Products and Services - unaffiliated customers | 26,249 | 24,066 | 17,516
Affiliated Customers |  |  |
Statement [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Affiliated Customers | Optum |  |  |
Statement [Line Items] |  |  |
Total revenues | 150,887 | 136,373 | 108,347
Operating Segments | UnitedHealthcare |  |  |
Statement [Line Items] |  |  |
Investment and other income | 2,413 | 2,251 | 923
Total revenues | 298,208 | 281,360 | 249,741
Total operating costs | 282,624 | 264,945 | 235,362
Earnings from operations | 15,584 | 16,415 | 14,379
Interest expense | 0 | 0 | 0
Loss on sale of subsidiary and subsidiaries held for sale | 8,310 |  |
Earnings before income taxes | 7,274 | 16,415 | 14,379
Total assets | 119,009 | 110,943 | 107,094
Segment, Expenditure, Addition to Long-Lived Assets | 781 | 866 | 799
Depreciation and amortization | 889 | 989 | 973
Operating Segments | Optum Health |  |  |
Statement [Line Items] |  |  |
Investment and other income | 2,239 | 1,532 | 928
Total revenues | 105,358 | 95,319 | 71,174
Total operating costs | 97,588 | 88,759 | 65,142
Earnings from operations | 7,770 | 6,560 | 6,032
Interest expense | 0 | 0 | 0
Loss on sale of subsidiary and subsidiaries held for sale | 0 |  |
Earnings before income taxes | 7,770 | 6,560 | 6,032
Total assets | 96,472 | 89,432 | 68,950
Segment, Expenditure, Addition to Long-Lived Assets | 1,008 | 1,199 | 997
Depreciation and amortization | 1,123 | 1,058 | 943
Operating Segments | Optum Insight |  |  |
Statement [Line Items] |  |  |
Investment and other income | 236 | 114 | 117
Total revenues | 18,757 | 18,932 | 14,581
Total operating costs | 15,660 | 14,664 | 10,993
Earnings from operations | 3,097 | 4,268 | 3,588
Interest expense | 0 | 0 | 0
Loss on sale of subsidiary and subsidiaries held for sale | 0 |  |
Earnings before income taxes | 3,097 | 4,268 | 3,588
Total assets | 34,452 | 34,173 | 31,090
Segment, Expenditure, Addition to Long-Lived Assets | 1,291 | 974 | 698
Depreciation and amortization | 1,294 | 1,229 | 841
Operating Segments | Optum Rx |  |  |
Statement [Line Items] |  |  |
Investment and other income | 314 | 192 | 62
Total revenues | 133,231 | 116,087 | 99,773
Total operating costs | 127,395 | 110,972 | 95,337
Earnings from operations | 5,836 | 5,115 | 4,436
Interest expense | 0 | 0 | 0
Loss on sale of subsidiary and subsidiaries held for sale | 0 |  |
Earnings before income taxes | 5,836 | 5,115 | 4,436
Total assets | 59,086 | 51,266 | 47,476
Segment, Expenditure, Addition to Long-Lived Assets | 419 | 347 | 308
Depreciation and amortization | 793 | 696 | 643
Operating Segments | Unaffiliated Customers | UnitedHealthcare |  |  |
Statement [Line Items] |  |  |
Premiums, revenues - unaffiliated customers | 286,004 | 269,052 | 238,783
Total revenues | 295,795 | 279,109 | 248,818
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 | 9,791 | 10,057 | 10,035
Operating Segments | Unaffiliated Customers | Optum Health |  |  |
Statement [Line Items] |  |  |
Premiums, revenues - unaffiliated customers | 22,806 | 21,775 | 18,374
Total revenues | 39,236 | 36,091 | 29,363
Operating Segments | Unaffiliated Customers | Optum Health | Products |  |  |
Statement [Line Items] |  |  |
Revenue from Products and Services - unaffiliated customers | 277 | 207 | 72
Operating Segments | Unaffiliated Customers | Optum Health | Services |  |  |
Statement [Line Items] |  |  |
Revenue from Products and Services - unaffiliated customers | 16,153 | 14,109 | 10,917
Operating Segments | Unaffiliated Customers | Optum Insight |  |  |
Statement [Line Items] |  |  |
Premiums, revenues - unaffiliated customers | 0 | 0 | 0
Total revenues | 6,640 | 7,922 | 5,176
Operating Segments | Unaffiliated Customers | Optum Insight | Products |  |  |
Statement [Line Items] |  |  |
Revenue from Products and Services - unaffiliated customers | 174 | 162 | 180
Operating Segments | Unaffiliated Customers | Optum Insight | Services |  |  |
Statement [Line Items] |  |  |
Revenue from Products and Services - unaffiliated customers | 6,466 | 7,760 | 4,996
Operating Segments | Unaffiliated Customers | Optum Rx |  |  |
Statement [Line Items] |  |  |
Premiums, revenues - unaffiliated customers | 0 | 0 | 0
Total revenues | 53,405 | 44,411 | 38,775
Operating Segments | Unaffiliated Customers | Optum Rx | Products |  |  |
Statement [Line Items] |  |  |
Revenue from Products and Services - unaffiliated customers | 49,775 | 42,214 | 37,172
Operating Segments | Unaffiliated Customers | Optum Rx | Services |  |  |
Statement [Line Items] |  |  |
Revenue from Products and Services - unaffiliated customers | 3,630 | 2,197 | 1,603
Operating Segments | Affiliated Customers | UnitedHealthcare |  |  |
Statement [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Operating Segments | Affiliated Customers | Optum Health |  |  |
Statement [Line Items] |  |  |
Total revenues | 63,883 | 57,696 | 40,883
Operating Segments | Affiliated Customers | Optum Insight |  |  |
Statement [Line Items] |  |  |
Total revenues | 11,881 | 10,896 | 9,288
Operating Segments | Affiliated Customers | Optum Rx |  |  |
Statement [Line Items] |  |  |
Total revenues | 79,512 | 71,484 | 60,936
Optum Eliminations |  |  |
Statement [Line Items] |  |  |
Investment and other income | 0 | 0 | 0
Total revenues | (4,389) | (3,703) | (2,760)
Total operating costs | (4,389) | (3,703) | (2,760)
Earnings from operations | 0 | 0 | 0
Interest expense | 0 | 0 | 0
Loss on sale of subsidiary and subsidiaries held for sale | 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 | (4,389) | (3,703) | (2,760)
Corporate and Eliminations |  |  |
Statement [Line Items] |  |  |
Investment and other income | 0 | 0 | 0
Total revenues | (150,887) | (136,373) | (108,347)
Total operating costs | (150,887) | (136,373) | (108,347)
Earnings from operations | 0 | 0 | 0
Interest expense | (3,906) | (3,246) | (2,092)
Loss on sale of subsidiary and subsidiaries held for sale | 0 |  |
Earnings before income taxes | (3,906) | (3,246) | (2,092)
Total assets | (10,741) | (12,094) | (8,905)
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 | $ (150,887) | $ (136,373) | $ (108,347)

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