Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of EPS (in shares)	12	15
Numerator for earnings per share calculation:
Net income	$ 2,012	$ 1,427
Income allocated to participating securities	0	(2)
Net income attributable to noncontrolling interests	(5)	(6)
Net income attributable to CVS Health	$ 2,007	$ 1,419
Denominator for earnings per share calculation:
Weighted average shares, basic (in shares)	1,306	1,298
Effect of dilutive securities (in shares)	6	4
Weighted average shares, diluted (in shares)	1,312	1,302
Earnings per share:
Earnings per share, basic (in dollars per share)	$ 1.54	$ 1.09
Earnings per share, diluted (in dollars per share)	$ 1.53	$ 1.09