Pension Benefits (Schedule Of Other Changes In Accumulated Other Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Mar. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	$ (36)
Prior service (cost) credit	2
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	(31)		59		42
Prior service credit	(8)		0		0
Net actuarial loss	(32)		(27)		(23)
Prior service (cost) credit	0		(1)		(1)
Foreign exchange impact and other	(1)		0		0
Total recognized in net periodic benefit cost and other comprehensive loss (income)	(72)		31		18
Projected benefit obligation	540	[1]	580	[1]	527	[1]
Foreign Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	12		11		19
Prior service credit	0		0		0
Net actuarial loss	(4)		(4)		(2)
Prior service (cost) credit	2		0		(1)
Foreign exchange impact and other	4		(4)		0
Total recognized in net periodic benefit cost and other comprehensive loss (income)	14		3		16
Projected benefit obligation	$ 934	[1]	$ 156	[1]	$ 143	[1]

[1] The benefit obligation is the projected benefit obligation.