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Medical Costs Payable (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Medical costs payable, beginning of period	$ 21,872	$ 21,690
Acquisitions	88	186
Reported medical costs:
Current year	140,052	118,114
Prior year	(1,300)	(800)
Total reported medical costs	138,752	117,314
Medical payments:
Payments for current year	(116,135)	(98,548)
Payments for prior years	(18,659)	(19,475)
Total medical payments	(134,794)	(118,023)
Medical costs payable, end of period	$ 25,918	$ 21,167

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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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