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Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Numerator for earnings (loss) per share calculation: |  |  |
Income (loss) from continuing operations | $ 7,201 | $ 6,631 | $ (596)
Income allocated to participating securities | 0 | (5) | (3)
Net (income) loss attributable to noncontrolling interests | (13) | 3 | 2
Income (loss) from continuing operations attributable to CVS Health | $ 7,188 | $ 6,629 | $ (597)
Denominator for earnings (loss) per share calculation: |  |  |
Weighted average shares, basic (in shares) | 1,309 | 1,301 | 1,044
Effect of dilutive securities (in shares) | 5 | 4 | 0
Weighted average shares, diluted (in shares) | 1,314 | 1,305 | 1,044
Earnings (loss) per share from continuing operations: |  |  |
Earnings (loss) per share from continuing operations, basic (USD per share) | $ 5.49 | $ 5.10 | $ (0.57)
Earnings (loss) per share from continuing operations, diluted (USD per share) | $ 5.47 | $ 5.08 | $ (0.57)
Employee Stock Option |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Antidilutive securities excluded from computation of EPS (in shares) | 15 | 17 | 13
Common Equivalent Shares |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Antidilutive securities excluded from computation of EPS (in shares) |  |  | 3

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