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Medical Claims and Benefits Payable - Components of Change in Medical Claims and Benefits Payable (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Insurance Claims    
Medical claims and benefits payable, beginning balance $ 1,854 $ 1,961
Components of medical care costs related to:    
Current year 7,372 7,069
Prior periods 58 232
Total medical care costs 7,314 6,837
Change in non-risk and other provider payables (34) 4
Payments for medical care costs related to:    
Current year 5,688 5,585
Prior years 1,486 1,450
Total paid 7,174 7,035
Medical claims and benefits payable, ending balance $ 1,960 $ 1,767