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Medical Costs Payable (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 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	12	0
Reported medical costs:
Current year	45,914	41,580
Prior year	(1,010)	(580)
Total reported medical costs	44,904	41,000
Medical payments:
Payments for current year	(25,960)	(23,471)
Payments for prior years	(15,995)	(16,447)
Total medical payments	(41,955)	(39,918)
Medical costs payable, end of period	$ 24,833	$ 22,772

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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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