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Acquisition and Divestiture - Pro Forma Financials (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2018
Business Combinations [Abstract] |  |
Total revenues | $ 60,865 | $ 180,164
Income from continuing operations attributable to CVS Health | $ 1,864 | $ 1,731
Basic earnings per share from continuing operations attributable to CVS Health (in dollars per share) | $ 1.44 | $ 1.34
Diluted earnings per share from continuing operations attributable to CVS Health (in dollars per share) | $ 1.43 | $ 1.33

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