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Medical Costs Payable (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 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	8	12
Reported medical costs:
Current year	52,813	45,914
Prior year	(290)	(1,010)
Total reported medical costs	52,523	44,904
Medical payments:
Payments for current year	(29,589)	(25,960)
Payments for prior years	(18,749)	(15,995)
Total medical payments	(48,338)	(41,955)
Medical costs payable, end of period	$ 28,676	$ 24,833

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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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Amount of increase (decrease) in the cost of settling unpaid claims after deduction of reinsurance recoveries related to the acquisition of a business. Includes, but is not limited to, claims which have been incurred but not reported.

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