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Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Numerator for earnings (loss) per share calculation: |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations | $ 1,744 | $ 1,529 | $ 1,931 | $ 1,427 | $ (422) | $ 1,390 | $ (2,562) | $ 998 | $ 6,631 | $ (596) | $ 6,631
Income allocated to participating securities |  |  |  |  |  |  |  |  | (5) | (3) | (24)
Net (income) loss attributable to noncontrolling interests |  |  |  |  |  |  |  |  | 3 | 2 | (1)
Income (loss) from continuing operations attributable to CVS Health |  |  |  |  |  |  |  |  | $ 6,629 | $ (597) | $ 6,606
Denominator for earnings (loss) per share calculation: |  |  |  |  |  |  |  |  |  |  |
Weighted average shares, basic (in shares) |  |  |  |  |  |  |  |  | 1,301 | 1,044 | 1,020
Effect of dilutive securities (in shares) |  |  |  |  |  |  |  |  | 4 | 0 | 4
Weighted average shares, diluted (in shares) |  |  |  |  |  |  |  |  | 1,305 | 1,044 | 1,024
Earnings (loss) per share from continuing operations: |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) per share from continuing operations, basic (USD per share) | $ 1.34 | $ 1.17 | $ 1.49 | $ 1.09 | $ (0.37) | $ 1.36 | $ (2.52) | $ 0.98 | $ 5.10 | $ (0.57) | $ 6.48
Earnings (loss) per share from continuing operations, diluted (USD per share) | $ 1.33 | $ 1.17 | $ 1.49 | $ 1.09 | $ (0.37) | $ 1.36 | $ (2.52) | $ 0.98 | $ 5.08 | $ (0.57) | $ 6.45
Employee Stock Option |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of EPS (in shares) |  |  |  |  |  |  |  |  | 17 | 13 | 10
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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