Medical Claims Payable (Reconciliation Of Net Incurred Medical Claims To Benefit Expense) (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
Reconciliation of net incurred medical claims to benefit expense [Line Items]
Total net incurred medical claims	$ 30,495	$ 29,683	$ 27,634	$ 27,131	$ 60,178	$ 54,765
Quality improvement and other claims expense	1,109	1,103	1,161	1,100	2,212	2,261
Benefit expense	$ 31,604	$ 30,786	$ 28,795	$ 28,231	$ 62,390	$ 57,026