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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |
Antidilutive securities excluded from computation of EPS (in shares) | 18 | 12 | 19 | 14
Numerator for earnings (loss) per share calculation: |  |  |  |
Income (loss) from continuing operations | $ 1,529 | $ 1,390 | $ 4,887 | $ (174)
Income from continuing operations allocated to participating securities | 0 | (1) | (3) | (3)
Net loss attributable to noncontrolling interests | 1 | 0 | 0 | 0
Income (loss) from continuing operations attributable to CVS Health | $ 1,530 | $ 1,389 | $ 4,884 | $ (177)
Denominator for earnings (loss) per share calculation: |  |  |  |
Weighted average shares, basic (in shares) | 1,302 | 1,020 | 1,300 | 1,018
Effect of dilutive securities (in shares) | 3 | 2 | 3 | 0
Weighted average shares, diluted (in shares) | 1,305 | 1,022 | 1,303 | 1,018
Earnings (loss) per share from continuing operations: |  |  |  |
Basic (in dollars per share) | $ 1.17 | $ 1.36 | $ 3.76 | $ (0.17)
Diluted (in dollars per share) | $ 1.17 | $ 1.36 | $ 3.75 | $ (0.17)
Continuing Operations |  |  |  |
Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |
Antidilutive securities excluded from computation of EPS (in shares) |  |  |  | 2

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