Segment Information 2 (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Revenue from the United States and international locations
Total revenue		$ 1,093	$ 1,007	$ 3,152	$ 3,024
United States
Revenue from the United States and international locations
Total revenue		682	642	1,997	1,936
EMEA
Revenue from the United States and international locations
Total revenue	[1]	256	223	720	667
Other
Revenue from the United States and international locations
Total revenue		$ 155	$ 142	$ 435	$ 421

[1] Consists of Europe, the Middle East and Africa.