Property, Plant and Equipment (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Property, Plant and Equipment [Abstract]
Interest Costs Capitalized	$ 33	$ 36	$ 12
Depreciation expense related to property, plant and equipment	$ 279	$ 242	$ 283