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Medical Claims and Benefits Payable - Incurred Claims and Allocated Adjustment Expense (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
claim
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Product Information [Line Items]      
Incurred Claims and Allocated Claims Adjustment Expenses $ 15,820 $ 13,905 $ 15,137
Incurred Claims and Allocated Claims Adjustment Expenses 45,255    
Total IBNP 1,631    
Benefit Year 2018      
Product Information [Line Items]      
Incurred Claims and Allocated Claims Adjustment Expenses 15,233 15,245 $ 15,478
Total IBNP $ 11    
Cumulative number of reported claims (in claim) | claim 110,000,000    
Benefit Year 2019      
Product Information [Line Items]      
Incurred Claims and Allocated Claims Adjustment Expenses $ 14,083 $ 14,176  
Total IBNP $ 27    
Cumulative number of reported claims (in claim) | claim 100,000,000    
Benefit Year 2020      
Product Information [Line Items]      
Incurred Claims and Allocated Claims Adjustment Expenses $ 15,939    
Total IBNP $ 1,593    
Cumulative number of reported claims (in claim) | claim 93,000,000