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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Net Income (Loss) Attributable to Parent [Abstract]      
Earnings attributable to Centene Corporation $ 3,305 $ 2,702 $ 1,202
Shares used in computing per share amounts:      
Weighted average number of common shares outstanding (in shares) 521,790 543,319 575,191
Common stock equivalents (as determined by applying the treasury stock method) (in shares) 1,954 2,385 6,849
Weighted average number of common shares and potential dilutive common shares outstanding (in shares) 523,744 545,704 582,040
Net earnings per common share attributable to Centene Corporation:      
Basic earnings per common share (in usd per share) $ 6.33 $ 4.97 $ 2.09
Diluted earnings per common share (in usd per share) $ 6.31 $ 4.95 $ 2.07
Anti-dilutive stock options and restricted stock units excluded from the calculation of diluted earnings per common share (in shares) 278 376 187