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Health Care Costs Payable - Components of Change in Health Care Costs Payable (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Health care costs payable, beginning of the period $ 12,049  
Less: Reinsurance recoverables 5  
Less: Impact of discount rate on long-duration insurance reserves (23)  
Health care costs payable, beginning of the period, net 12,067  
Acquisitions, net 0 $ 1,102
Add: Components of incurred health care costs    
Current year 56,177 42,705
Prior years (662) (619)
Total incurred health care costs 55,515 42,086
Less: Claims paid    
Current year 43,218 32,502
Prior years 10,514 8,800
Total claims paid 53,732 41,302
Health care costs payable, end of the period, net 13,850 12,015
Add: Reinsurance recoverables 59 5
Add: Impact of discount rate on long-duration insurance reserves (24) (22)
Health care costs payable, end of the period 13,885 11,998
Health Care Benefits    
Less: Claims paid    
Benefit costs recorded in other insurance liabilities 48 42
Corporate/ Other    
Less: Claims paid    
Benefit costs recorded in other insurance liabilities $ 93 102
Health Insurance Product Line    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Health care costs payable, beginning of the period   10,142
Less: Reinsurance recoverables   5
Less: Impact of discount rate on long-duration insurance reserves   8
Health care costs payable, beginning of the period, net   $ 10,129