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Earnings (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Numerator for earnings (loss) per share calculation:        
Net income attributable to CVS Health, basic $ (3,975) $ 87 $ (1,175) $ 2,970
Net income attributable to CVS Health, diluted $ (3,975) $ 87 $ (1,175) $ 2,970
Denominator for earnings (loss) per share calculation:        
Weighted average shares, basic (in shares) 1,269 1,259 1,266 1,258
Weighted average shares, diluted (in shares) 1,269 1,259 1,266 1,262
Earnings (loss) per share:        
Basic (in dollars per share) $ (3.13) $ 0.07 $ (0.93) $ 2.36
Diluted (in dollars per share) $ (3.13) $ 0.07 $ (0.93) $ 2.35
Restricted stock units and performance stock units        
Denominator for earnings (loss) per share calculation:        
Effect of dilutive securities (in shares) 0 0 0 3
Stock options and stock appreciation rights        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of EPS (in shares) 9 8 10 7
Denominator for earnings (loss) per share calculation:        
Effect of dilutive securities (in shares) 0 0 0 1
Common Equivalent Shares        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from computation of EPS (in shares) 3   3