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Fidelis Care Acquisition - Proforma Information (unaudited) (Details) - Fidelis Care - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Total revenues	$ 65,792	$ 58,275
Net earnings attributable to Centene Corporation		$ 936
Diluted earnings per share (in usd per share)		$ 2.27

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