Intangible Assets (Narrative) (Details) $ in Millions	9 Months Ended
	Dec. 31, 2016 USD ($)
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Document Period End Date	Dec. 31, 2016
Other, Net [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Gain (Loss) on Disposition of Intangible Assets	$ 354