Pension Benefits (Schedule Of Changes In Benefit Obligations And Plan Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Mar. 31, 2013
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of period	$ 540	[1]	$ 580	[1]
Service cost	1		4		4
Interest cost	19		19		21
Actuarial (gain) loss	53		(24)
Benefit payments	(30)		(30)
Amendments	0		(9)
Acquisitions	0		0
Foreign exchange impact and other	0		0
Benefit obligation at end of period (1)	583	[1]	540	[1]	580	[1]
Fair value of plan assets at beginning of period	300		290
Actual return on plan assets	16		28
Employer and participant contributions	12		12
Defined Benefit Plan, Benefits Paid, Net of Contribution	(30)		(30)
Acquisitions	0		0
Foreign exchange impact and other	0		0
Fair value of plan assets at end of period	298		300		290
Funded status at end of period	(285)		(240)
Current liabilities	(17)		(13)
Long-term liabilities	(268)		(227)
Total	(285)		(240)
Foreign Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of period	934	[1]	156	[1]
Service cost	16		6		3
Interest cost	34		11		7
Actuarial (gain) loss	194		15
Benefit payments	(49)		(12)
Amendments	(6)		0
Acquisitions	0		740
Foreign exchange impact and other	(160)		18
Benefit obligation at end of period (1)	963	[1]	934	[1]	156	[1]
Fair value of plan assets at beginning of period	590		135
Actual return on plan assets	88		11
Employer and participant contributions	73		12
Defined Benefit Plan, Benefits Paid, Net of Contribution	(49)		(10)
Acquisitions	0		426
Foreign exchange impact and other	(90)		16
Fair value of plan assets at end of period	612		590		135
Funded status at end of period	(351)		(344)
Current liabilities	(6)		(9)
Long-term liabilities	(345)		(335)
Total	$ (351)		$ (344)

[1] The benefit obligation is the projected benefit obligation.