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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Net Income (Loss) Attributable to Parent [Abstract]    
Earnings attributable to Centene Corporation $ 1,541 $ 1,311
Shares used in computing per share amounts:    
Weighted average number of common shares outstanding (in shares) 492,069 496,214
Common stock equivalents (as determined by applying the treasury stock method) (in shares) 3,522 1,966
Weighted average number of common shares and potential dilutive common shares outstanding (in shares) 495,591 498,180
Net earnings per common share attributable to Centene Corporation:    
Basic earnings per common share (in dollars per share) $ 3.13 $ 2.64
Diluted earnings per common share (in dollars per share) $ 3.11 $ 2.63
Anti-dilutive stock options, restricted stock and restricted stock units excluded from the calculation of diluted earnings (loss) per common share (in shares) 3,566 2,380