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Segment Financial Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement [Line Items]      
Premiums, revenues - unaffiliated customers $ 201,478 $ 189,699 $ 178,087
Products, revenues - unaffiliated customers 34,145 31,597 29,601
Services, revenues - unaffiliated customers 20,016 18,973 17,183
Investment and other income 1,502 1,886 1,376
Total revenues 257,141 242,155 226,247
Earnings from operations 22,405 19,685 17,344
Interest expense (1,663) (1,704) (1,400)
Earnings before income taxes 20,742 17,981 15,944
Total assets 197,289 173,889 152,221
Purchases of property, equipment and capitalized software 2,051 2,071 2,063
Depreciation and amortization 2,891 2,720 2,428
Optum      
Statement [Line Items]      
Investment and other income 770 749 548
Total revenues 136,308 112,950 101,280
Earnings from operations 10,046 9,359 8,231
Interest expense 0 0 0
Earnings before income taxes 10,046 9,359 8,231
Total assets 106,778 91,971 74,788
Purchases of property, equipment and capitalized software 1,364 1,230 1,302
Depreciation and amortization 1,971 1,794 1,583
Unaffiliated Customers      
Statement [Line Items]      
Premiums, revenues - unaffiliated customers 201,478 189,699 178,087
Products, revenues - unaffiliated customers 34,145 31,597 29,601
Services, revenues - unaffiliated customers 20,016 18,973 17,183
Total revenues 255,639 240,269 224,871
Unaffiliated Customers | Optum      
Statement [Line Items]      
Premiums, revenues - unaffiliated customers 9,799 5,916 3,805
Products, revenues - unaffiliated customers 34,145 31,597 29,601
Services, revenues - unaffiliated customers 11,552 10,051 8,817
Total revenues 55,496 47,564 42,223
Affiliated Customers      
Statement [Line Items]      
Total revenues 0 0 0
Affiliated Customers | Optum      
Statement [Line Items]      
Total revenues 80,042 64,637 58,509
Operating Segments | UnitedHealthcare      
Statement [Line Items]      
Investment and other income 732 1,137 828
Total revenues 200,875 193,842 183,476
Earnings from operations 12,359 10,326 9,113
Interest expense 0 0 0
Earnings before income taxes 12,359 10,326 9,113
Total assets 98,229 88,250 82,938
Purchases of property, equipment and capitalized software 687 841 761
Depreciation and amortization 920 926 845
Operating Segments | OptumHealth      
Statement [Line Items]      
Investment and other income 680 672 481
Total revenues 39,808 30,317 24,145
Earnings from operations 3,434 2,963 2,430
Interest expense 0 0 0
Earnings before income taxes 3,434 2,963 2,430
Total assets 52,073 40,444 29,837
Purchases of property, equipment and capitalized software 715 573 593
Depreciation and amortization 703 565 439
Operating Segments | OptumInsight      
Statement [Line Items]      
Investment and other income 39 21 21
Total revenues 10,802 10,006 9,008
Earnings from operations 2,725 2,494 2,243
Interest expense 0 0 0
Earnings before income taxes 2,725 2,494 2,243
Total assets 15,425 15,181 11,039
Purchases of property, equipment and capitalized software 461 495 517
Depreciation and amortization 670 672 654
Operating Segments | OptumRx      
Statement [Line Items]      
Investment and other income 51 56 46
Total revenues 87,498 74,288 69,536
Earnings from operations 3,887 3,902 3,558
Interest expense 0 0 0
Earnings before income taxes 3,887 3,902 3,558
Total assets 39,280 36,346 33,912
Purchases of property, equipment and capitalized software 188 162 192
Depreciation and amortization 598 557 490
Operating Segments | Unaffiliated Customers | UnitedHealthcare      
Statement [Line Items]      
Premiums, revenues - unaffiliated customers 191,679 183,783 174,282
Products, revenues - unaffiliated customers 0 0 0
Services, revenues - unaffiliated customers 8,464 8,922 8,366
Total revenues 200,143 192,705 182,648
Operating Segments | Unaffiliated Customers | OptumHealth      
Statement [Line Items]      
Premiums, revenues - unaffiliated customers 9,799 5,916 3,805
Products, revenues - unaffiliated customers 33 31 52
Services, revenues - unaffiliated customers 6,815 5,732 4,925
Total revenues 16,647 11,679 8,782
Operating Segments | Unaffiliated Customers | OptumInsight      
Statement [Line Items]      
Premiums, revenues - unaffiliated customers 0 0 0
Products, revenues - unaffiliated customers 135 116 111
Services, revenues - unaffiliated customers 3,687 3,630 3,280
Total revenues 3,822 3,746 3,391
Operating Segments | Unaffiliated Customers | OptumRx      
Statement [Line Items]      
Premiums, revenues - unaffiliated customers 0 0 0
Products, revenues - unaffiliated customers 33,977 31,450 29,438
Services, revenues - unaffiliated customers 1,050 689 612
Total revenues 35,027 32,139 30,050
Operating Segments | Affiliated Customers | UnitedHealthcare      
Statement [Line Items]      
Total revenues 0 0 0
Operating Segments | Affiliated Customers | OptumHealth      
Statement [Line Items]      
Total revenues 22,481 17,966 14,882
Operating Segments | Affiliated Customers | OptumInsight      
Statement [Line Items]      
Total revenues 6,941 6,239 5,596
Operating Segments | Affiliated Customers | OptumRx      
Statement [Line Items]      
Total revenues 52,420 42,093 39,440
Optum Eliminations      
Statement [Line Items]      
Investment and other income 0 0 0
Total revenues (1,800) (1,661) (1,409)
Earnings from operations 0 0 0
Interest expense 0 0 0
Earnings before income taxes 0 0 0
Total assets 0 0 0
Purchases of property, equipment and capitalized software 0 0 0
Depreciation and amortization 0 0 0
Optum Eliminations | Unaffiliated Customers      
Statement [Line Items]      
Premiums, revenues - unaffiliated customers 0 0 0
Products, revenues - unaffiliated customers 0 0 0
Services, revenues - unaffiliated customers 0 0 0
Total revenues 0 0 0
Optum Eliminations | Affiliated Customers      
Statement [Line Items]      
Total revenues (1,800) (1,661) (1,409)
Corporate and Eliminations      
Statement [Line Items]      
Investment and other income 0 0 0
Total revenues (80,042) (64,637) (58,509)
Earnings from operations 0 0 0
Interest expense (1,663) (1,704) (1,400)
Earnings before income taxes (1,663) (1,704) (1,400)
Total assets (7,718) (6,332) (5,505)
Purchases of property, equipment and capitalized software 0 0 0
Depreciation and amortization 0 0 0
Corporate and Eliminations | Unaffiliated Customers      
Statement [Line Items]      
Premiums, revenues - unaffiliated customers 0 0 0
Products, revenues - unaffiliated customers 0 0 0
Services, revenues - unaffiliated customers 0 0 0
Total revenues 0 0 0
Corporate and Eliminations | Affiliated Customers      
Statement [Line Items]      
Total revenues $ (80,042) $ (64,637) $ (58,509)