Stockholders' Equity (Other Comprehensive Income (Loss), Net of Tax) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2013		Jun. 30, 2012
Stockholders' Equity Attributable to Parent [Abstract]
Foreign currency translation adjustments arising during period, net of income tax expense of $2 and $4	$ (61)		$ (41)
Unrealized gains on cash flow hedges arising during period, net of income tax expense of nil and nil	1		0
Amortization of actuarial loss, prior service cost and transition obligation, net of income tax (benefit) of ($4) and ($3) (1)	7	[1]	5	[1]
Foreign currency translation adjustments, net of income tax expense of nil and nil	0		1
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(7)		(6)
Other Comprehensive Loss, net of tax	$ (53)		$ (35)

[1] Pre-tax amount reclassified into cost of sales and operating expenses in the condensed consolidated statements of operations. The related tax expense (benefit) was reclassified into income tax expense in the consolidated statements of operations.