Quarterly report pursuant to Section 13 or 15(d)

Fidelis Care Acquisition - Pro Forma Information (unaudited) (Details)

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Fidelis Care Acquisition - Pro Forma Information (unaudited) (Details) - Fidelis Care - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Business Acquisition [Line Items]      
Total revenues $ 14,387 $ 49,170 $ 42,954
Net earnings attributable to Centene Corporation $ 248   $ 721
Diluted earnings per share (in dollars per share) $ 1.22   $ 3.55