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Segment Information (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2025
USD ($)
segment
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Segment Reporting [Abstract]      
Number of operating segments | segment 4    
Number of reportable segments | segment 4    
Segment Reporting Information [Line Items]      
Premium and service revenues $ 174,581 $ 145,505 $ 140,095
Premium tax 20,196 17,566 13,904
Total external revenues 194,777 163,071 153,999
Total revenues 194,777 163,071 153,999
Medical costs 157,702 125,707 118,894
Cost of services 2,670 2,729 3,564
Other operating expense 42,028 31,460 28,611
Other income (expense) 895 1,082 668
Earnings (loss) before income tax (6,728) 4,257 3,598
Segment gross margin 14,209 17,069 17,637
Operating Segments      
Segment Reporting Information [Line Items]      
Total revenues 16,854 16,879 16,735
Eliminations      
Segment Reporting Information [Line Items]      
Total revenues (16,854) (16,879) (16,735)
Premium      
Segment Reporting Information [Line Items]      
Premium and service revenues 171,556 142,303 135,636
Service      
Segment Reporting Information [Line Items]      
Premium and service revenues 3,025 3,202 4,459
Premium and service revenues      
Segment Reporting Information [Line Items]      
Premium and service revenues 174,581 145,505 140,095
Medicaid      
Segment Reporting Information [Line Items]      
Total revenues 110,434 101,417 100,759
Medical costs 84,450 77,516 78,210
Cost of services 98 89 4
Segment gross margin 5,690 6,246 8,641
Medicaid | Operating Segments      
Segment Reporting Information [Line Items]      
Premium tax 20,196 17,566 13,904
Total external revenues 110,434 101,417 100,759
Total revenues 0 0 0
Medicaid | Eliminations      
Segment Reporting Information [Line Items]      
Total revenues 0 0 0
Medicaid | Premium | Operating Segments      
Segment Reporting Information [Line Items]      
Premium and service revenues 90,137 83,758 86,853
Medicaid | Service | Operating Segments      
Segment Reporting Information [Line Items]      
Premium and service revenues 101 93 2
Medicaid | Premium and service revenues | Operating Segments      
Segment Reporting Information [Line Items]      
Premium and service revenues 90,238 83,851 86,855
Medicare      
Segment Reporting Information [Line Items]      
Total revenues 37,210 23,032 22,261
Medical costs 34,227 20,437 19,394
Cost of services 0 0 0
Segment gross margin 2,983 2,595 2,867
Medicare | Operating Segments      
Segment Reporting Information [Line Items]      
Premium tax 0 0 0
Total external revenues 37,210 23,032 22,261
Total revenues 0 0 0
Medicare | Eliminations      
Segment Reporting Information [Line Items]      
Total revenues 0 0 0
Medicare | Premium | Operating Segments      
Segment Reporting Information [Line Items]      
Premium and service revenues 37,210 23,032 22,261
Medicare | Service | Operating Segments      
Segment Reporting Information [Line Items]      
Premium and service revenues 0 0 0
Medicare | Premium and service revenues | Operating Segments      
Segment Reporting Information [Line Items]      
Premium and service revenues 37,210 23,032 22,261
Commercial      
Segment Reporting Information [Line Items]      
Total revenues 42,003 33,702 24,845
Medical costs 36,902 26,039 19,816
Cost of services 0 0 0
Segment gross margin 5,101 7,663 5,029
Commercial | Operating Segments      
Segment Reporting Information [Line Items]      
Premium tax 0 0 0
Total external revenues 42,003 33,702 24,845
Total revenues 0 0 0
Commercial | Eliminations      
Segment Reporting Information [Line Items]      
Total revenues 0 0 0
Commercial | Premium | Operating Segments      
Segment Reporting Information [Line Items]      
Premium and service revenues 42,001 33,699 24,843
Commercial | Service | Operating Segments      
Segment Reporting Information [Line Items]      
Premium and service revenues 2 3 2
Commercial | Premium and service revenues | Operating Segments      
Segment Reporting Information [Line Items]      
Premium and service revenues 42,003 33,702 24,845
Other/Eliminations      
Segment Reporting Information [Line Items]      
Total revenues 5,130 4,920 6,134
Medical costs 2,123 1,715 1,474
Cost of services 2,572 2,640 3,560
Segment gross margin 435 565 1,100
Other/Eliminations | Operating Segments      
Segment Reporting Information [Line Items]      
Premium tax 0 0 0
Total external revenues 5,130 4,920 6,134
Total revenues 16,854 16,879 16,735
Other/Eliminations | Eliminations      
Segment Reporting Information [Line Items]      
Total revenues (16,854) (16,879) (16,735)
Other/Eliminations | Premium | Operating Segments      
Segment Reporting Information [Line Items]      
Premium and service revenues 2,208 1,814 1,679
Other/Eliminations | Service | Operating Segments      
Segment Reporting Information [Line Items]      
Premium and service revenues 2,922 3,106 4,455
Other/Eliminations | Premium and service revenues | Operating Segments      
Segment Reporting Information [Line Items]      
Premium and service revenues $ 5,130 $ 4,920 $ 6,134