Property, Plant and Equipment (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Property, Plant and Equipment [Abstract]
Fully depreciated assets	$ 1
Capitalized interest costs	$ 2	$ 14	$ 20
Capital leases, term of contract	15 years