Medical Costs Payable (Tables)

3 Months Ended

Mar. 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 three months ended March 31:

(in millions)	2019			2018
Medical costs payable, beginning of period	$	19,891		$	17,871
Acquisitions	35			211
Reported medical costs:
Current year	39,239			36,153
Prior years	(300		)	(290		)
Total reported medical costs	38,939			35,863
Medical payments:
Payments for current year	(22,973		)	(21,237		)
Payments for prior years	(14,753		)	(13,119		)
Total medical payments	(37,726		)	(34,356		)
Medical costs payable, end of period	$	21,139		$	19,589