Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 7,192	$ 6,631	$ (596)
Other comprehensive income (loss), net of tax:
Net unrealized investment gains	440	677	97
Foreign currency translation adjustments	3	162	(29)
Net cash flow hedges	(31)	(33)	330
Pension and other postretirement benefits	(17)	111	(124)
Other comprehensive income (loss)	395	917	274
Comprehensive income (loss)	7,587	7,548	(322)
Comprehensive (income) loss attributable to noncontrolling interests	(13)	3	2
Comprehensive income (loss) attributable to CVS Health	$ 7,574	$ 7,551	$ (320)