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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Numerator for earnings (loss) per share calculation: |  |  |  |
Income (loss) from continuing operations | $ (2,562) | $ 1,097 | $ (1,564) | $ 2,059
Income from continuing operations allocated to participating securities | (1) | (3) | (3) | (8)
Income from continuing operations attributable to noncontrolling interest |  |  |  | (1)
Income (loss) from continuing operations attributable to CVS Health | $ (2,563) | $ 1,094 | $ (1,567) | $ 2,050
Denominator for earnings per share calculation: |  |  |  |
Weighted average shares, basic (in shares) | 1,018.0 | 1,019.0 | 1,017.0 | 1,024.0
Effect of dilutive securities (in shares) |  | 5.0 |  | 5.0
Weighted average shares, diluted (in shares) | 1,018.0 | 1,024.0 | 1,017.0 | 1,029.0
Earnings (loss) per share from continuing operations: |  |  |  |
Earnings (loss) per share, basic (in dollars per share) | $ (2.52) | $ 1.07 | $ (1.54) | $ 2.00
Earnings (loss) per share, diluted (in dollars per share) | $ (2.52) | $ 1.07 | $ (1.54) | $ 1.99
Common Equivalent Shares |  |  |  |
Reconciliation of basic and diluted earnings per common share |  |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) | 1.9 |  | 2.3 |
Employee Stock Option |  |  |  |
Reconciliation of basic and diluted earnings per common share |  |  |  |
Antidilutive securities excluded from computation of earnings per share (in shares) | 15.3 | 11.0 | 14.3 | 9.4

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- Definition Amount after tax of income (loss) from continuing operations attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.13) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4613673-111683 + Details
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- Definition Amount after tax of income (loss) from continuing operations including portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 + Details
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