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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, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Reconciliation of net incurred medical claims to benefit expense [Line Items]            
Total net incurred medical claims $ 23,844 $ 22,727 $ 18,748 $ 20,530 $ 46,571 $ 39,278
Quality improvement and other claims expense 919 972 799 959 1,891 1,758
Benefit expense 24,763 23,699 19,547 21,489 48,462 41,036
Commercial Specialty Business Segment [Member]            
Reconciliation of net incurred medical claims to benefit expense [Line Items]            
Total net incurred medical claims 6,718 6,072 5,147 5,797 12,790 10,944
Government Business Segment [Member]            
Reconciliation of net incurred medical claims to benefit expense [Line Items]            
Total net incurred medical claims 16,723 16,319 13,233 14,603 33,042 27,836
Other Segment [Member]            
Reconciliation of net incurred medical claims to benefit expense [Line Items]            
Total net incurred medical claims $ 403 $ 336 $ 368 $ 130 $ 739 $ 498