Goodwill And Intangible Assets, Net (Narrative - Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense of intangible assets	$ 70	$ 52	$ 211	$ 147
Annual amortization expense, 2014	279		279
Annual amortization expense, 2015	261		261
Annual amortization expense, 2016	229		229
Annual amortization expense, 2017	207		207
Annual amortization expense, 2018	190		190
Total amortization expense, after 2018	$ 1,111		$ 1,111