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Pension Benefits (Schedule Of Projected Benefit Obligation, Accumulated Benefit Obligation And Fair Value Of Plan Assets For Pension Plans) (Details) (Defined Pension Benefit Plans [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
Defined Pension Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 670	$ 533
Accumulated benefit obligation	667	529
Fair value of plan assets	$ 410	$ 319

If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

+ References+ Details

- Definition

If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

+ References+ Details

- Definition

If aggregate disclosures are presented, the aggregate projected benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

+ References+ Details