Income Taxes (Components Of Provision For Income Taxes Related To Continuing Operations) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Income Tax Disclosure [Abstract]
Federal	$ 484	$ (84)	$ 265
State and local	64	14	51
Foreign	178	40	28
Total current	726	(30)	344
Federal	24	538	132
State and local	10	80	29
Foreign	(18)	(7)	9
Total deferred	16	611	170
Income tax provision	$ 742	$ 581	$ 514