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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Net Income (Loss) Attributable to Parent [Abstract]      
Earnings (loss) attributable to Centene Corporation $ (6,674) $ 3,305 $ 2,702
Shares used in computing per share amounts:      
Weighted average number of common shares outstanding (in shares) 493,116 521,790 543,319
Common stock equivalents (as determined by applying the treasury stock method) (in shares) 0 1,954 2,385
Weighted average number of common shares and potential dilutive common shares outstanding (in shares) 493,116 523,744 545,704
Net earnings (loss) per common share attributable to Centene Corporation:      
Basic earnings (loss) per common share (in usd per share) $ (13.53) $ 6.33 $ 4.97
Diluted earnings (loss) per common share (in usd per share) $ (13.53) $ 6.31 $ 4.95
Anti-dilutive stock options and restricted stock units excluded from the calculation of diluted earnings per common share (in shares) 5,658 278 376