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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 |

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