Medical Claims Payable (Reconciliation Of The Beginning And Ending Balances For Medical Claims Payable) (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
Medical Claims Payable [Line Items]
Gross medical claims payable, beginning of period		$ 15,348		$ 13,282	$ 15,348	$ 13,282
Ceded medical claims payable, beginning of period		(6)		(21)	(6)	(21)
Net medical claims payable, beginning of period		15,342		13,261	15,342	13,261
Business combinations and purchase adjustments					0	133
Current period net incurred medical claims					61,290	55,737
Prior periods redundancies					(1,112)	(972)
Total net incurred medical claims	$ 30,495	$ 29,683	$ 27,634	$ 27,131	60,178	54,765
Net payments attributable to current period medical claims					48,217	42,882
Net payments attributable to prior periods medical claims					11,409	10,401
Total net payments					59,626	53,283
Net medical claims payable, end of period	15,894		14,876		15,894	14,876
Ceded medical claims payable, end of period	8		13		8	13
Gross medical claims payable, end of period	$ 15,902		$ 14,889		$ 15,902	$ 14,889