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Medical Costs Payable (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Medical costs payable, beginning of period	$ 24,483	$ 21,872
Acquisitions	177	88
Reported medical costs:
Current year	157,601	140,052
Prior year	(350)	(1,300)
Total reported medical costs	157,251	138,752
Medical payments:
Payments for current year	(130,788)	(116,135)
Payments for prior years	(22,059)	(18,659)
Total medical payments	(152,847)	(134,794)
Medical costs payable, end of period	$ 29,064	$ 25,918

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The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date.

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