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Pension Benefits (Schedule Of Reconciliation Of Level 3 Plan Assets Held) (Details) (Defined Pension Benefit Plans [Member], USD $) In Millions, unless otherwise specified							12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010	Mar. 31, 2012 Real Estate Funds [Member]	Mar. 31, 2011 Real Estate Funds [Member]	Mar. 31, 2011 Hedge Funds [Member]	Mar. 31, 2012 Level 3 [Member]	Mar. 31, 2011 Level 3 [Member]	Mar. 31, 2012 Level 3 [Member] Real Estate Funds [Member]	Mar. 31, 2011 Level 3 [Member] Real Estate Funds [Member]	Mar. 31, 2012 Level 3 [Member] Hedge Funds [Member]	Mar. 31, 2011 Level 3 [Member] Hedge Funds [Member]	Mar. 31, 2012 Level 3 [Member] Other Funds [Member]	Mar. 31, 2011 Level 3 [Member] Other Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of period	$ 410	$ 416	$ 391	$ 17	$ 5	$ 5	$ 10	$ 26	$ 5	$ 19	$ 5	$ 5	$ 0	$ 2
Unrealized gain on plan assets still held							1		1		0		0
Purchases, sales and settlements							6	(14)	11	(14)	(5)	0	0	0
Transfer in and/or out of Level 3								(2)		0		0		(2)
Fair value of plan assets at end of period	$ 410	$ 416	$ 391	$ 17	$ 5	$ 5	$ 17	$ 10	$ 17	$ 5	$ 0	$ 5	$ 0	$ 0

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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