v3.24.3
Medical Claims Liability - Schedule of Change in Medical Claims Liability (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2024
Sep. 30, 2023
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Balance, January 1   $ 18,000 $ 16,745
Less: Reinsurance recoverable   49 26
Balance, January 1, net   17,951 16,719
Incurred related to:      
Current year   95,888 90,148
Prior years   (1,985) (1,888)
Total incurred   93,903 88,260
Paid related to:      
Current year   80,017 75,402
Prior years   13,899 12,481
Total paid   93,916 87,883
Plus: Premium deficiency reserve   (5)  
Balance, September 30, net $ 17,933 17,933 17,096
Plus: Reinsurance recoverable 62 62 45
Balance, September 30 17,995 17,995 17,141
Medicaid      
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Balance, January 1   10,814 11,253
Less: Reinsurance recoverable   5 7
Balance, January 1, net   10,809 11,246
Incurred related to:      
Current year   59,327 60,379
Prior years   (1,247) (1,303)
Total incurred   58,080 59,076
Paid related to:      
Current year   50,198 50,774
Prior years   8,543 8,517
Total paid   58,741 59,291
Plus: Premium deficiency reserve   0  
Balance, September 30, net 10,148 10,148 11,031
Plus: Reinsurance recoverable 20 20 4
Balance, September 30 10,168 10,168 11,035
Medicare      
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Balance, January 1   3,612 3,431
Less: Reinsurance recoverable   0 0
Balance, January 1, net   3,612 3,431
Incurred related to:      
Current year   16,134 14,680
Prior years   (439) (326)
Total incurred   15,695 14,354
Paid related to:      
Current year   13,006 12,069
Prior years   2,713 2,452
Total paid   15,719 14,521
Plus: Premium deficiency reserve (90) (5)  
Balance, September 30, net 3,583 3,583 3,264
Plus: Reinsurance recoverable 0 0 0
Balance, September 30 3,583 3,583 3,264
Commercial      
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Balance, January 1   3,460 1,921
Less: Reinsurance recoverable   44 19
Balance, January 1, net   3,416 1,902
Incurred related to:      
Current year   19,211 13,994
Prior years   (306) (256)
Total incurred   18,905 13,738
Paid related to:      
Current year   15,773 11,575
Prior years   2,523 1,376
Total paid   18,296 12,951
Plus: Premium deficiency reserve   0  
Balance, September 30, net 4,025 4,025 2,689
Plus: Reinsurance recoverable 42 42 41
Balance, September 30 4,067 4,067 2,730
Other      
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Balance, January 1   114 140
Less: Reinsurance recoverable   0 0
Balance, January 1, net   114 140
Incurred related to:      
Current year   1,216 1,095
Prior years   7 (3)
Total incurred   1,223 1,092
Paid related to:      
Current year   1,040 984
Prior years   120 136
Total paid   1,160 1,120
Plus: Premium deficiency reserve   0  
Balance, September 30, net 177 177 112
Plus: Reinsurance recoverable 0 0 0
Balance, September 30 $ 177 $ 177 $ 112