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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Health care costs payable, beginning of period $ 8,678    
Less: Claims paid      
Health care costs payable, end of period 10,142 $ 8,678  
Health Care Benefits      
Less: Claims paid      
Benefit costs recorded in other insurance liabilities 79 58 $ 41
Corporate/ Other      
Less: Claims paid      
Benefit costs recorded in other insurance liabilities 249 271 221
Health Insurance Product Line      
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Health care costs payable, beginning of period 8,678 7,936 6,879
Less: Reinsurance recoverables 8 10 5
Less: Impact of discount rate on long-duration insurance reserves 0 0 0
Health care costs payable, beginning of period, net 8,670 7,926 6,874
Acquisitions, net 0 0 414
Add: Components of incurred health care costs      
Current year 71,399 64,631 55,835
Prior years (654) (788) (429)
Total incurred health care costs 70,745 63,843 55,406
Less: Claims paid      
Current year 61,640 56,323 48,770
Prior years 7,646 6,792 6,009
Total claims paid 69,286 63,115 54,779
Add: Premium deficiency reserve 0 16 11
Health care costs payable, end of period, net 10,129 8,670 7,926
Add: Reinsurance recoverables 5 8 10
Add: Impact of discount rate on long-duration insurance reserves 8 0 0
Health care costs payable, end of period 10,142 8,678 7,936
Premium deficiency reserve $ 0 $ 16 $ 11