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Health Care Costs Payable - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Liability for Claims and Claims Adjustment Expense [Line Items]    
Incurred but not reported (IBNR) claims liability, net $ 7,900  
Health Insurance Product Line    
Liability for Claims and Claims Adjustment Expense [Line Items]    
Decrease in prior years' healthcare costs payable $ (676) $ (652)