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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, 2021
Jun. 30, 2020
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Health care costs payable, beginning of the period, net $ 7,936  
Less: Claims paid    
Health care costs payable, end of the period, net 8,414  
Health Care Benefits    
Less: Claims paid    
Benefit costs recorded in other insurance liabilities 27 $ 20
Corporate / Other    
Less: Claims paid    
Benefit costs recorded in other insurance liabilities 99 119
Health Insurance Product Line    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Health care costs payable, beginning of the period 7,936 6,879
Less: Reinsurance recoverables 10 5
Health care costs payable, beginning of the period, net 7,926 6,874
Acquisition 0 412
Add: Components of incurred health care costs    
Current year 32,183 26,390
Prior years (709) (420)
Total incurred health care costs 31,474 25,970
Less: Claims paid    
Current year 24,600 20,223
Prior years 6,409 5,704
Total claims paid 31,009 25,927
Add: Premium deficiency reserve 5 29
Health care costs payable, end of the period, net 8,396 7,358
Add: Reinsurance recoverables 18 4
Health care costs payable, end of the period 8,414 7,362
Premium deficiency reserve $ 5 $ 29