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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Numerator for earnings per share calculation: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations | $ 3,287 | $ 1,285 | $ 1,097 | $ 962 | $ 1,707 | $ 1,542 | $ 924 | $ 1,147 | $ 6,631 | $ 5,320 | $ 5,230
Income allocated to participating securities |  |  |  |  |  |  |  |  | (24) | (27) | (26)
Net income attributable to noncontrolling interest |  |  |  |  |  |  |  |  | (1) | (2) | (2)
Income from continuing operations attributable to CVS Health |  |  |  |  |  |  |  |  | $ 6,606 | $ 5,291 | $ 5,202
Denominator for earnings per share calculation: |  |  |  |  |  |  |  |  |  |  |
Weighted average shares, basic (in shares) |  |  |  |  |  |  |  |  | 1,020 | 1,073 | 1,118
Effect of dilutive securities (in shares) |  |  |  |  |  |  |  |  | 4 | 6 | 8
Weighted average shares, diluted (in shares) |  |  |  |  |  |  |  |  | 1,024 | 1,079 | 1,126
Earnings per share from continuing operations: |  |  |  |  |  |  |  |  |  |  |
Earnings per share, basic (in dollars per share) | $ 3.23 | $ 1.26 | $ 1.07 | $ 0.93 | $ 1.60 | $ 1.44 | $ 0.86 | $ 1.04 | $ 6.48 | $ 4.93 | $ 4.65
Earnings per share, diluted (in dollars per share) | $ 3.22 | $ 1.26 | $ 1.07 | $ 0.92 | $ 1.59 | $ 1.43 | $ 0.86 | $ 1.04 | $ 6.45 | $ 4.91 | $ 4.62

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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=66902209&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=68079674&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=68079674&loc=SL4569616-111683 + Details
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