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Medical Claims Liability - Schedule of Change in Medical Claims Liability (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Balance, January 1 $ 18,308 $ 18,000 $ 16,745
Less: Reinsurance recoverables 65 49 26
Balance, January 1, net 18,243 17,951 16,719
Incurred related to:      
Current year 160,109 128,312 120,680
Prior years (2,315) (2,447) (2,036)
Total incurred 157,794 125,865 118,644
Paid related to:      
Current year 140,691 111,456 104,725
Prior years 14,677 13,959 12,937
Total paid 155,368 125,415 117,662
Plus: Premium deficiency reserve (92) (158) 250
Plus: Divestitures (109)    
Balance December 31, net 20,468 18,243 17,951
Plus: Reinsurance recoverables 76 65 49
Balance, December 31 20,544 18,308 18,000
Medicaid      
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Balance, January 1 10,299 10,814 11,253
Less: Reinsurance recoverables 18 5 7
Balance, January 1, net 10,281 10,809 11,246
Incurred related to:      
Current year 85,697 78,886 79,747
Prior years (1,247) (1,370) (1,537)
Total incurred 84,450 77,516 78,210
Paid related to:      
Current year 75,872 69,351 69,904
Prior years 8,500 8,693 8,743
Total paid 84,372 78,044 78,647
Plus: Premium deficiency reserve 0 0 0
Plus: Divestitures 0    
Balance December 31, net 10,359 10,281 10,809
Plus: Reinsurance recoverables 16 18 5
Balance, December 31 10,375 10,299 10,814
Medicare      
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Balance, January 1 3,358 3,612 3,431
Less: Reinsurance recoverables 0 0 0
Balance, January 1, net 3,358 3,612 3,431
Incurred related to:      
Current year 34,869 21,170 19,487
Prior years (550) (575) (343)
Total incurred 34,319 20,595 19,144
Paid related to:      
Current year 30,651 18,036 16,631
Prior years 2,533 2,655 2,582
Total paid 33,184 20,691 19,213
Plus: Premium deficiency reserve (92) (158) 250
Plus: Divestitures 0    
Balance December 31, net 4,401 3,358 3,612
Plus: Reinsurance recoverables 0 0 0
Balance, December 31 4,401 3,358 3,612
Commercial      
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Balance, January 1 4,463 3,460 1,921
Less: Reinsurance recoverables 47 44 19
Balance, January 1, net 4,416 3,416 1,902
Incurred related to:      
Current year 37,397 26,548 19,966
Prior years (495) (509) (150)
Total incurred 36,902 26,039 19,816
Paid related to:      
Current year 32,213 22,547 16,823
Prior years 3,482 2,492 1,479
Total paid 35,695 25,039 18,302
Plus: Premium deficiency reserve 0 0 0
Plus: Divestitures 0    
Balance December 31, net 5,623 4,416 3,416
Plus: Reinsurance recoverables 60 47 44
Balance, December 31 5,683 4,463 3,460
Other      
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Balance, January 1 188 114 140
Less: Reinsurance recoverables 0 0 0
Balance, January 1, net 188 114 140
Incurred related to:      
Current year 2,146 1,708 1,480
Prior years (23) 7 (6)
Total incurred 2,123 1,715 1,474
Paid related to:      
Current year 1,955 1,522 1,367
Prior years 162 119 133
Total paid 2,117 1,641 1,500
Plus: Premium deficiency reserve 0 0 0
Plus: Divestitures (109)    
Balance December 31, net 85 188 114
Plus: Reinsurance recoverables 0 0 0
Balance, December 31 $ 85 $ 188 $ 114