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Currency (Gains) Losses (Details 1) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
	Sep. 30, 2014	Mar. 31, 2014
Currency gains included in AOCI, net of tax and Non controlling interests
Cumulative currency translation adjustment — beginning of period	$ 90	$ (30)
Effect of changes in exchange rates	(106)	120
Cumulative currency translation adjustment — end of period	$ (16)	$ 90

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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