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Medical Claims Payable Medical Claims Payable (Reconciliation of the Claims Development to the Claims Liability) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net medical claims payable, end of period $ 12,780 $ 11,089   $ 8,614
Ceded medical claims payable end of period 41 46 $ 90 33
Insurance lines other than short duration 255      
Gross medical claims payable, end of period 13,076 11,359    
Commercial Specialty Business Segment [Member]        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net medical claims payable, end of period 3,622 3,281   3,025
Ceded medical claims payable end of period 11 13 62 14
Insurance lines other than short duration 0      
Gross medical claims payable, end of period 3,633      
Government Business Segment [Member]        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net medical claims payable, end of period 8,928 7,613   5,589
Ceded medical claims payable end of period 30 33 28 19
Insurance lines other than short duration 255      
Gross medical claims payable, end of period 9,213      
Other Segment [Member]        
Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Line Items]        
Net medical claims payable, end of period 230 195   0
Ceded medical claims payable end of period 0 $ 0 $ 0 $ 0
Insurance lines other than short duration 0      
Gross medical claims payable, end of period $ 230