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Medical Costs Payable (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 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	171	46
Reported medical costs:
Current year	104,936	92,570
Prior year	(320)	(1,120)
Total reported medical costs	104,616	91,450
Medical payments:
Payments for current year	(78,937)	(69,808)
Payments for prior years	(21,355)	(18,429)
Total medical payments	(100,292)	(88,237)
Medical costs payable, end of period	$ 28,978	$ 25,131

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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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