Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of EPS (in shares)	8	17	8	16
Numerator for earnings per share calculation:
Net income attributable to CVS Health	$ 1,598	$ 1,224	$ 6,604	$ 6,206
Denominator for earnings per share calculation:
Weighted average shares, basic (in shares)	1,321	1,310	1,318	1,308
Effect of dilutive securities (in shares)	8	5	8	6
Weighted average diluted shares outstanding (in shares)	1,329	1,315	1,326	1,314
Earnings per share:
Earnings per share, basic (in dollars per share)	$ 1.21	$ 0.93	$ 5.01	$ 4.74
Earnings per share, diluted (in dollars per share)	$ 1.20	$ 0.93	$ 4.98	$ 4.72