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Acquisitions and Divestitures - 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 | $ 243,232 | $ 236,000
Income from continuing operations | $ 1,152 | $ 6,813
Basic earnings per share from continuing operations attributable to CVS Health (in dollars per share) | $ 0.89 | $ 5.25
Diluted earnings per share from continuing operations attributable to CVS Health (in dollars per share) | $ 0.88 | $ 5.21

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