Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 1,931	$ (2,563)	$ 3,358	$ (1,565)
Other comprehensive income (loss), net of tax:
Net unrealized investment gains	251	0	585	0
Foreign currency translation adjustments	3	(27)	4	(26)
Net cash flow hedges	(3)	(4)	(7)	339
Other comprehensive income (loss)	251	(31)	582	313
Comprehensive income (loss)	2,182	(2,594)	3,940	(1,252)
Comprehensive (income) loss attributable to noncontrolling interests	5	0	(1)	0
Comprehensive income (loss) attributable to CVS Health	$ 2,187	$ (2,594)	$ 3,939	$ (1,252)