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Medical Claims and Benefits Payable - Components of Change in Medical Claims and Benefits Payable (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Insurance Claims      
Medical claims and benefits payable, beginning balance   $ 1,961 $ 2,192
Components of medical care costs related to:      
Current period   10,613 11,670
Prior periods   (253) (308)
Total medical care costs   10,360 11,362
Change in non-risk and other provider payables   131 60
Payments for medical care costs related to:      
Current period   8,996 9,866
Prior periods   1,481 1,706
Total paid   10,477 11,572
Medical claims and benefits payable, ending balance $ 2,042 $ 1,975 2,042
CMS Subsidies      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Reimbursement $ 5   $ 81