Pension Benefits (Schedule Of Reconciliation Of Level 3 Plan Assets Held) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Acquisitions	$ 0	$ 0
Fair value of plan assets at beginning of period	290	284
Fair value of plan assets at end of period	300	290
United States [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Acquisitions	0
Fair value of plan assets at beginning of period	14	12
Unrealized gain on plan assets still held	2	1
Purchases, sales and settlements	0	1
Fair value of plan assets at end of period	16	14
United States [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at end of period	16	14
United States [Member] | Real Estate Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Acquisitions	0
Fair value of plan assets at beginning of period	14	12
Unrealized gain on plan assets still held	2	1
Purchases, sales and settlements	0	1
Fair value of plan assets at end of period	16	14
United States [Member] | Hedge Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Acquisitions	0
Fair value of plan assets at beginning of period	0	0
Unrealized gain on plan assets still held	0	0
Purchases, sales and settlements	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]
Acquisitions	(426)	0
Fair value of plan assets at beginning of period	135	126
Fair value of plan assets at end of period	590	135
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Acquisitions	6
Fair value of plan assets at beginning of period	5	5
Unrealized gain on plan assets still held	1	0
Purchases, sales and settlements	0	0
Fair value of plan assets at end of period	12	5
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	5
Foreign Pension Plan, Defined Benefit [Member] | Real Estate Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Acquisitions	1
Fair value of plan assets at beginning of period	5	5
Unrealized gain on plan assets still held	1	0
Purchases, sales and settlements	0	0
Fair value of plan assets at end of period	7	5
Foreign Pension Plan, Defined Benefit [Member] | Hedge Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Acquisitions	5
Fair value of plan assets at beginning of period	0	0
Unrealized gain on plan assets still held	0	0
Purchases, sales and settlements	0	0
Fair value of plan assets at end of period	$ 5	$ 0