Stockholders' Equity (Other Comprehensive Income (Loss), Net of Tax) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Mar. 31, 2012
Stockholders' Equity Note [Abstract]
Unrealized losses on cash flow hedges, net of income tax benefit of nil, nil and nil	$ (6)		$ 0		$ (5)
Foreign currency translation adjustments arising during period, net of income tax expense (benefit) of nil, ($2) and $2 (1)	9	[1]	(52)	[1]	(56)	[1]
Reclassified to income statement, net of income tax expense of $24, nil and nil (2)	44	[2]	0	[2]	0	[2]
Foreign currency translation adjustments, net of income tax expense (benefit) of $24, ($2) and $2	53		(52)		(56)
Net actuarial gain (loss) and prior service credit (cost) arising during period, net of income tax (benefit) of $16, ($22) and ($18)	17		(40)		(38)
Amortization of actuarial loss, prior service cost and transition obligation, net of income tax expense of $12, $12 and $9 (3)	22	[3]	18	[3]	17	[3]
Foreign currency translation adjustments, net of income tax expense of nil, nil and nil	(4)		4		0
Reclassified to income statement, net of income tax expense of $1, nil and nil	1		0		0
Retirement related benefit plans, net of income tax expense (benefit) of ($10), ($10) and ($9)	36		(18)		(21)
Other Comprehensive Income (Loss), Net of Tax	$ 83		$ (70)		$ (82)

[1] The 2014 amounts include net foreign currency translation gain of $21 million attributable to noncontrolling interests.

[2] As a result of our sale of our 49% equity interest in Nadro, foreign currency translation net losses of $44 million were reclassified from AOCI to other income, within our consolidated statement of operations. Such losses were previously considered in our impairment evaluation of the investment when we committed to a plan to sell the investment during the fourth quarter of 2013, and accordingly did not impact earnings for 2014.

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