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Currency (Gains) Losses (Included in AOCI) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Currency gains included in AOCI, net of tax and Non controlling interests
Cumulative currency translation adjustment — beginning of period	$ 90	$ (30)	$ 23
Effect of changes in exchange rates	(304)	120	(42)
Sale of investment in foreign entities	0	0	(11)
Cumulative currency translation adjustment — end of period	(214)	90	(30)
Derivative [Line Items]
Amounts reclassified from AOCI, net	(24)	16	(3)
Accumulated Translation Adjustment [Member]
Derivative [Line Items]
Amounts reclassified from AOCI, net	$ 0	$ 0	$ 11	$ 11

Amount after tax of reclassification adjustment from accumulated other comprehensive income for translation gain (loss) realized upon the sale or liquidation of an investment in a foreign entity and foreign currency hedges that are designated and qualified as hedging instruments for hedges of the foreign currency exposure of a net investment in a foreign operation.

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