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Medical Costs Payable Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items]
Medical costs payable, beginning of period	$ 21,690	$ 19,891	$ 17,871
Acquisitions	316	679	339
Reported medical costs:
Current year	160,276	157,020	145,723
Prior years	(880)	(580)	(320)
Total reported medical costs	159,396	156,440	145,403
Medical payments:
Payments for current year	(139,974)	(137,155)	(127,155)
Payments for prior years	(19,556)	(18,165)	(16,567)
Total medical payments	(159,530)	(155,320)	(143,722)
Medical costs payable, end of period	$ 21,872	$ 21,690	$ 19,891

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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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