Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of EPS (in shares)	8	17	9	15
Numerator for earnings per share calculation:
Net income attributable to CVS Health	$ 2,783	$ 2,975	$ 5,006	$ 4,982
Denominator for earnings per share calculation:
Weighted average shares, basic (in shares)	1,319	1,309	1,316	1,307
Effect of dilutive securities (in shares)	8	5	9	6
Weighted average diluted shares outstanding (in shares)	1,327	1,314	1,325	1,313
Earnings per share:
Earnings per share, basic (in dollars per share)	$ 2.11	$ 2.27	$ 3.80	$ 3.81
Earnings per share, diluted (in dollars per share)	$ 2.10	$ 2.26	$ 3.78	$ 3.79