Income Taxes 6 (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Income Taxes (Textual) [Abstract]
Total deferred tax assets, net of valuation allowance	$ 655	$ 750
Federal, state and foreign net operating loss carryforwards	764	876
Net operating loss carryforwards subject to expiration	612
Net operating loss carryforwards expiration period	between 2013 and 2032
Net operating loss carryforwards not subject to expiration	152
Change in valuation allowance	7	(17)
Unremitted earnings of foreign subsidiaries	2,220	1,999
Determination of tax on unremitted foreign earnings is not practicable	It is not practicable to determine the amount of tax associated with such unremitted earnings.
Liability for uncertain tax positions, Gross	486	641
Liability for uncertain tax positions, Current	0	0
Deferred tax assets related to uncertain tax positions	47	56
Unrecognized tax benefits that would affect effective tax rate	311	410
Amount of interest and penalties accrued	104	118	98
Amount of interest and penalties recognized	(14)	20	16
Deferred tax assets reclassified from non-current to current	150
Timing of resolution of income tax examinations	12 months
Period of unrecognized tax benefit	12 months
Significant change in existing unrecognized tax benefits within next 12 months	$ 250