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Health Care Costs Payable - Components of Change in Health Care Costs Payable (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Health care costs payable, beginning of the period, net $ 8,808  
Less: Claims paid    
Health care costs payable, end of the period, net 10,260  
Health Care Benefits    
Less: Claims paid    
Benefit costs recorded in other insurance liabilities 19 $ 13
Corporate / Other    
Less: Claims paid    
Benefit costs recorded in other insurance liabilities 59 45
Health Insurance Product Line    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Health care costs payable, beginning of the period 8,808 7,936
Less: Reinsurance recoverables 8 10
Health care costs payable, beginning of the period, net 8,800 7,926
Add: Components of incurred health care costs    
Current year 18,536 16,291
Prior years (676) (652)
Total incurred health care costs 17,860 15,639
Less: Claims paid    
Current year 10,225 9,538
Prior years 6,183 5,767
Total claims paid 16,408 15,305
Add: Premium deficiency reserve 13 7
Health care costs payable, end of the period, net 10,252 8,267
Add: Reinsurance recoverables 8 5
Health care costs payable, end of the period 10,260 8,272
Premium deficiency reserve 13 7
Health Insurance Product Line | Thailand Business    
Less: Claims paid    
Other $ (13) $ 0