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Acquisition of Aetna - Pro Forma (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Business Combinations [Abstract] |  |
Total revenues | $ 243,398 | $ 236,000
Income from continuing operations | $ 1,123 | $ 6,813
Basic earnings per share from continuing operations attributable to CVS Health (in dollars per share) | $ 0.87 | $ 5.25
Diluted earnings (loss) per share from continuing operations attributable to CVS Health (in dollars per share) | $ 0.86 | $ 5.21

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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