Pension Benefits (Schedule Of Reconciliation Of Level 3 Plan Assets Held) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Mar. 31, 2015	Mar. 31, 2014
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of period	$ 300	$ 290
Acquisitions	0	0
Fair value of plan assets at end of period	298	300
United States [Member] \| Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of period	16	14
Acquisitions	0	0
Purchases, sales and settlements	0	0
Unrealized gain on plan assets still held	2	2
Fair value of plan assets at end of period	18	16
United States [Member] \| Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of period	18	16
United States [Member] \| Real Estate Funds [Member] \| Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of period	16	14
Acquisitions	0	0
Purchases, sales and settlements	0	0
Unrealized gain on plan assets still held	2	2
Fair value of plan assets at end of period	18	16
United States [Member] \| Hedge Funds [Member] \| Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of period	0	0
Acquisitions	0	0
Purchases, sales and settlements	0	0
Unrealized gain on plan assets still held	0	0
Fair value of plan assets at end of period	0	0
Foreign Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of period	590	135
Acquisitions	0	(426)
Fair value of plan assets at end of period	612	590
Foreign Pension Plan, Defined Benefit [Member] \| Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of period	12	5
Acquisitions	0	6
Purchases, sales and settlements	17	0
Unrealized gain on plan assets still held	1	1
Fair value of plan assets at end of period	30	12
Foreign Pension Plan, Defined Benefit [Member] \| Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of period	26	26
Foreign Pension Plan, Defined Benefit [Member] \| Real Estate Funds [Member] \| Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of period	7	5
Acquisitions	0	1
Purchases, sales and settlements	18	0
Unrealized gain on plan assets still held	1	1
Fair value of plan assets at end of period	26	7
Foreign Pension Plan, Defined Benefit [Member] \| Hedge Funds [Member] \| Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of period	5	0
Acquisitions	0	5
Purchases, sales and settlements	(1)	0
Unrealized gain on plan assets still held	0	0
Fair value of plan assets at end of period	$ 4	$ 5

Actual return on plan assets, separately identifying the amount related to assets still held at the reporting date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(iv)(02)(A)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)(iv)(02)(A)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2446-114920

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- Definition

The amount of increase in the plan assets attributed to a business combination.

+ References

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Section 35

-Paragraph 50

-URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930

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- Definition

Amount of increase (decrease) in plan assets from purchases, sales and settlement of plan obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(iv)(02)(B)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)(iv)(02)(B)

-URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2446-114920

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