Medical Costs Payable (Tables)

12 Months Ended

Dec. 31, 2019

Insurance [Abstract]

Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block]

The following table shows the components of the change in medical costs payable for the years ended December 31:

(in millions)	2019			2018			2017
Medical costs payable, beginning of period	$	19,891		$	17,871		$	16,391
Acquisitions	679			339			83
Reported medical costs:
Current year	157,020			145,723			130,726
Prior years	(580		)	(320		)	(690		)
Total reported medical costs	156,440			145,403			130,036
Medical payments:
Payments for current year	(137,155		)	(127,155		)	(113,811		)
Payments for prior years	(18,165		)	(16,567		)	(14,828		)
Total medical payments	(155,320		)	(143,722		)	(128,639		)
Medical costs payable, end of period	$	21,690		$	19,891		$	17,871

Short-duration Insurance Contracts, Reconciliation of Claims Development to Liability [Table Text Block]

The following is information about incurred and paid medical cost development as of December 31, 2019:

	Net Incurred Medical Costs
(in millions)	For the Years ended December 31,
Year	2018			2019
2018	$	145,723		$	145,293
2019				157,020
Total				$	302,313
	Net Cumulative Medical Payments
(in millions)	For the Years ended December 31,
Year	2018			2019
2018	$	(127,155	)	$	(144,143	)
2019				(137,155		)
Total				(281,298		)
Net remaining outstanding liabilities prior to 2018				675
Total medical costs payable				$	21,690