Acquisitions Pro Forma Financials (Details) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($) $ / shares
Pro Forma Financials [Abstract]
Total revenues | $	$ 59,093
Net Income attributable to CVS Health | $	$ 1,807
Net income per share attributable to CVS Health
Basic | $ / shares	$ 1.40
Diluted | $ / shares	$ 1.39