Segment Information Net Revenue by Platform (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Schedule of Net Revenue by Platform [Line Items]
Net revenue	$ 1,387	$ 1,593	$ 1,348	$ 1,209	$ 1,238	$ 1,289	$ 1,286	$ 1,137	$ 5,537	$ 4,950	$ 5,150
Total consoles, net revenue [Domain]
Schedule of Net Revenue by Platform [Line Items]
Net revenue									3,774	3,333	3,635
PC and Browsers, net revenue [Domain]
Schedule of Net Revenue by Platform [Line Items]
Net revenue									1,017	780	827
Mobile, net revenue [Domain]
Schedule of Net Revenue by Platform [Line Items]
Net revenue									727	824	672
Other, net revenue [Domain]
Schedule of Net Revenue by Platform [Line Items]
Net revenue									$ 19	$ 13	$ 16