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Medical Claims and Benefits Payable - Components of the Change (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]      
Medical claims and benefits payable, beginning balance $ 1,854 $ 1,961 $ 2,192
Components of medical care costs related to:      
Current year 15,939 14,176 15,478
Prior periods (119) (271) (341)
Total medical care costs 15,820 13,905 15,137
Payments for medical care costs related to:      
Current year 13,871 12,554 13,671
Prior years 1,507 1,482 1,710
Total paid 15,378 14,036 15,381
Acquisition - Magellan Complete Care 294 0 0
Change in non-risk and other provider payables 106 24 13
Medical claims and benefits payable, ending balance $ 2,696 $ 1,854 1,961
CMS Subsidies      
Liability for Claims and Claims Adjustment Expense [Line Items]      
Disposal group, operating expense     $ 81