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Condensed Financial Information of Registrant - Condensed Statements Of Operations (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Expenses:                      
Selling, general and administrative expenses                 $ 6,043 $ 4,446 $ 3,673
Other income (expense):                      
Investment and other income                 253 190 114
Interest expense                 (343) (255) (217)
Earnings (loss) before income taxes                 1,368 1,134 1,160
Income tax benefit                 474 326 599
Net earnings                 894 808 561
Loss attributable to noncontrolling interests                 6 20 1
Net earnings attributable to Centene Corporation $ 241 $ 19 $ 300 $ 340 $ 230 $ 205 $ 254 $ 139 $ 900 $ 828 $ 562
Net earnings per share:                      
Basic earnings per common share (in usd per share) $ 0.59 $ 0.05 $ 0.77 $ 0.98 $ 0.67 $ 0.59 $ 0.74 $ 0.40 $ 2.31 $ 2.40 $ 1.76
Diluted earnings per common share (in usd per share) $ 0.57 $ 0.05 $ 0.75 $ 0.96 $ 0.65 $ 0.58 $ 0.72 $ 0.39 $ 2.26 $ 2.34 $ 1.71
Parent Company                      
Expenses:                      
Selling, general and administrative expenses                 $ 24 $ 6 $ 5
Other income (expense):                      
Investment and other income                 3 2 2
Interest expense                 (334) (247) (201)
Earnings (loss) before income taxes                 (355) (251) (204)
Income tax benefit                 (64) (114) (76)
Net earnings (loss) before equity in subsidiaries                 (291) (137) (128)
Equity in earnings from subsidiaries                 1,185 945 689
Net earnings                 894 808 561
Loss attributable to noncontrolling interests                 6 20 1
Net earnings attributable to Centene Corporation                 $ 900 $ 828 $ 562
Net earnings per share:                      
Basic earnings per common share (in usd per share)                 $ 2.31 $ 2.40 $ 1.76
Diluted earnings per common share (in usd per share)                 $ 2.26 $ 2.34 $ 1.71