Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of EPS (in shares)	10	12
Numerator for earnings per share calculation:
Net income attributable to CVS Health	$ 2,223	$ 2,007
Denominator for earnings per share calculation:
Weighted average shares, basic (in shares)	1,313	1,306
Effect of dilutive securities (in shares)	9	6
Weighted average diluted shares outstanding (in shares)	1,322	1,312
Earnings per share:
Earnings per share, basic (in dollars per share)	$ 1.69	$ 1.54
Earnings per share, diluted (in dollars per share)	$ 1.68	$ 1.53