Pension Benefits (Schedule Of Amounts Recognized In Accumulated Other Comprehensive Income) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Foreign Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	$ 175	$ 71
Prior service cost	(6)	0
Total	169	71
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss	220	188
Prior service cost	0	(7)
Total	$ 220	$ 181