Medical Claims Payable (Reconciliation Of Net Incurred Medical Claims To Benefit Expense) (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Reconciliation of net incurred medical claims to benefit expense [Line Items]
Total net incurred medical claims	$ 28,511	$ 27,634	$ 27,131	$ 25,704	$ 23,844	$ 22,727	$ 83,276	$ 72,275
Quality improvement and other claims expense	893	1,143	1,084	941	919	972	3,120	2,832
Benefit expense	29,404	28,777	28,215	26,645	24,763	23,699	86,396	75,107
Commercial & Specialty Business Segment [Member]
Reconciliation of net incurred medical claims to benefit expense [Line Items]
Total net incurred medical claims	7,510	7,522	6,834	7,213	6,718	6,072	21,866	20,003
Government Business Segment [Member]
Reconciliation of net incurred medical claims to benefit expense [Line Items]
Total net incurred medical claims	20,601	19,788	19,943	18,071	16,723	16,319	60,332	51,113
Other Segment [Member]
Reconciliation of net incurred medical claims to benefit expense [Line Items]
Total net incurred medical claims	$ 400	$ 324	$ 354	$ 420	$ 403	$ 336	$ 1,078	$ 1,159