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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Net Income (Loss) Attributable to Parent [Abstract]      
Earnings attributable to Centene Corporation $ 1,202 $ 1,347 $ 1,808
Shares used in computing per share amounts:      
Weighted average number of common shares outstanding (in shares) 575,191 582,832 570,722
Common stock equivalents (as determined by applying the treasury stock method) (in shares) 6,849 7,684 8,413
Weighted average number of common shares and potential dilutive common shares outstanding (in shares) 582,040 590,516 579,135
Net earnings per common share attributable to Centene Corporation:      
Basic earnings per common share (in usd per share) $ 2.09 $ 2.31 $ 3.17
Diluted earnings per common share (in usd per share) $ 2.07 $ 2.28 $ 3.12
Anti-dilutive stock options and restricted stock units excluded from the calculation of diluted earnings per common share (in shares) 187 44 398