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Medical Claims and Benefits Payable - Incurred Claims and Allocated Adjustment Expense (Details)
security in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
security
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Product Information [Line Items]      
Incurred Claims and Allocated Claims Adjustment Expenses $ 23,704 $ 15,820 $ 13,905
Incurred Claims and Allocated Claims Adjustment Expenses 54,039    
Total IBNP 2,480    
Benefit Year 2019      
Product Information [Line Items]      
Incurred Claims and Allocated Claims Adjustment Expenses 14,040 14,083 $ 14,176
Total IBNP $ 12    
Cumulative number of reported claims (in claim) | security 105    
Benefit Year 2020      
Product Information [Line Items]      
Incurred Claims and Allocated Claims Adjustment Expenses $ 16,056 $ 16,233  
Total IBNP $ 52    
Cumulative number of reported claims (in claim) | security 140    
Benefit Year 2021      
Product Information [Line Items]      
Incurred Claims and Allocated Claims Adjustment Expenses $ 23,943    
Total IBNP $ 2,416    
Cumulative number of reported claims (in claim) | security 181