Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 300	$ 987	$ 707	$ 1,405
Other comprehensive income (loss) adjustments, net of tax:
Currency translation	116	10	(25)	(59)
Derivatives	(15)	(28)	(174)	(39)
Comprehensive income	401	969	508	1,307
Comprehensive income attributable to noncontrolling interests	(25)	(36)	(53)	(65)
Comprehensive income attributable to redeemable noncontrolling interests	(4)	(5)	(6)	(10)
Comprehensive income attributable to Discovery, Inc.	$ 372	$ 928	$ 449	$ 1,232