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Health Care Costs Payable - Components of Change in Health Care Costs Payable (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Health care costs payable, beginning of period $ 10,142    
Acquisition, net 1,098    
Add: Components of incurred health care costs      
Current year 86,639    
Prior years (685)    
Total incurred health care costs 85,954    
Less: Claims paid      
Current year 75,529    
Prior years 9,585    
Total claims paid 85,114    
Add: Premium deficiency reserve 0 $ 0  
Health care costs payable, end of period, net 12,067    
Add: Reinsurance recoverables 5    
Add: Impact of discount rate on long-duration insurance reserves (23)    
Health care costs payable, end of period 12,049    
Health care costs payable, end of period   10,142  
Premium deficiency reserve 0 0  
Health Care Benefits      
Less: Claims paid      
Benefit costs recorded in other insurance liabilities 83 79 $ 58
Corporate/ Other      
Less: Claims paid      
Benefit costs recorded in other insurance liabilities 210 249 271
Health Insurance Product Line      
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Health care costs payable, beginning of period 10,142    
Health care costs payable, beginning of period 10,142 8,678 7,936
Less: Reinsurance recoverables 5 8 10
Less: Impact of discount rate on long-duration insurance reserves 8 0 0
Health care costs payable, beginning of period, net 10,129 8,670 7,926
Acquisition, net   0 0
Add: Components of incurred health care costs      
Current year   71,399 64,631
Prior years   (654) (788)
Total incurred health care costs   70,745 63,843
Less: Claims paid      
Current year   61,640 56,323
Prior years   7,646 6,792
Total claims paid   69,286 63,115
Add: Premium deficiency reserve   0 16
Health care costs payable, end of period, net   10,129 8,670
Add: Reinsurance recoverables $ 5 5 8
Add: Impact of discount rate on long-duration insurance reserves   8 0
Health care costs payable, end of period   10,142  
Health care costs payable, end of period   10,142 8,678
Premium deficiency reserve   $ 0 $ 16