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Acquisition of Aetna - Pro Forma Financials (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2018
Business Combinations [Abstract] |  |
Total revenues | $ 60,206 | $ 119,299
Income (loss) from continuing operations attributable to CVS Health | $ (1,940) | $ (133)
Basic earnings (loss) per share from continuing operations attributable to CVS Health (in dollars per share) | $ (1.50) | $ (0.10)
Diluted earnings (loss) per share from continuing operations attributable to CVS Health (in dollars per share) | $ (1.50) | $ (0.10)

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