Pension Benefits (Schedule Of Projected Benefit Obligation, Accumulated Benefit Obligation And Fair Value Of Plan Assets For Pension Plans) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014		Mar. 31, 2013
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 583	[1]	$ 540	[1]	$ 580	[1]
Accumulated benefit obligation	583		540
Pension Plan Assets	298		300		290
Foreign Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	963	[1]	934	[1]	156	[1]
Accumulated benefit obligation	897		894
Pension Plan Assets	$ 612		$ 590		$ 135

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