Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 330	$ 297	$ 1,037	$ 1,702
Other comprehensive income (loss) adjustments, net of tax:
Currency translation	101	(146)	76	(205)
Derivatives	22	30	(152)	(9)
Comprehensive income	453	181	961	1,488
Comprehensive income attributable to noncontrolling interests	(29)	(29)	(82)	(94)
Comprehensive income attributable to redeemable noncontrolling interests	(1)	(5)	(7)	(15)
Comprehensive income attributable to Discovery, Inc.	$ 423	$ 147	$ 872	$ 1,379