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Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |
Antidilutive securities excluded from computation of EPS (in shares) | 23.3 | 15.3 | 19.3 | 14.3
Numerator for earnings (loss) per share calculation: |  |  |  |
Income (loss) from continuing operations | $ 1,931 | $ (2,562) | $ 3,358 | $ (1,564)
Income from continuing operations allocated to participating securities | (1) | (1) | (3) | (3)
Net (income) loss attributable to noncontrolling interests | 5 | 0 | (1) | 0
Income (loss) from continuing operations attributable to CVS Health | $ 1,935 | $ (2,563) | $ 3,354 | $ (1,567)
Denominator for earnings (loss) per share calculation: |  |  |  |
Weighted average shares outstanding, basic (in shares) | 1,301.0 | 1,018.0 | 1,299.0 | 1,017.0
Dilutive effect of outstanding stock-based compensation awards (in shares) | 1.0 | 0.0 | 3.0 | 0.0
Weighted average shares outstanding, diluted (in shares) | 1,302.0 | 1,018.0 | 1,302.0 | 1,017.0
Earnings (loss) per share from continuing operations: |  |  |  |
Income (loss) from continuing operations attributable to CVS Health, basic (in dollars per share) | $ 1.49 | $ (2.52) | $ 2.58 | $ (1.54)
Income (loss) from continuing operations attributable to CVS Health, diluted (in dollars per share) | $ 1.49 | $ (2.52) | $ 2.58 | $ (1.54)
Continuing Operations |  |  |  |
Earnings Per Share, Basic and Diluted [Line Items] |  |  |  |
Antidilutive securities excluded from computation of EPS (in shares) |  | 1.9 |  | 2.3

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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