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Medical Claims Payable (Reconciliation Of Net Incurred Medical Claims To Benefit Expense) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Reconciliation of net incurred medical claims to benefit expense [Line Items]            
Total net incurred medical claims $ 18,748 $ 20,530 $ 19,484 $ 18,339 $ 39,278 $ 37,823
Quality improvement and other claims expense 799 959 884 943 1,758 1,827
Benefit expense 19,547 21,489 20,368 19,282 41,036 39,650
Commercial Specialty Business Segment [Member]            
Reconciliation of net incurred medical claims to benefit expense [Line Items]            
Total net incurred medical claims 5,147 5,797 6,422 5,856 10,944 12,278
Government Business Segment [Member]            
Reconciliation of net incurred medical claims to benefit expense [Line Items]            
Total net incurred medical claims 13,233 14,603 $ 13,062 $ 12,483 27,836 25,545
Other Segment [Member]            
Reconciliation of net incurred medical claims to benefit expense [Line Items]            
Total net incurred medical claims $ 368 $ 130     $ 498 $ 0