Pension Benefits (Summary Of Pension Plan Assets Using Fair Value Hierarchy By Asset Class) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Mar. 31, 2013		Mar. 31, 2012
United States [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	$ 300		$ 290		$ 284
United States [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	8		8
United States [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	19		20
United States [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	132		127
United States [Member] | Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	7		12
United States [Member] | Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	22		19
United States [Member] | Mortgage Backed Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	10		6
United States [Member] | Asset-backed Securities and Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	22		22
United States [Member] | Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	63		61
United States [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	16		14
United States [Member] | Other Commingled Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0
United States [Member] | Other funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0
United States [Member] | Total [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	299		289
United States [Member] | Receivables [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	1	[1]	1	[2]
United States [Member] | Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	8		0
United States [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	19		20
United States [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
United States [Member] | Fair Value, Inputs, Level 1 [Member] | Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
United States [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
United States [Member] | Fair Value, Inputs, Level 1 [Member] | Mortgage Backed Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
United States [Member] | Fair Value, Inputs, Level 1 [Member] | Asset-backed Securities and Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
United States [Member] | Fair Value, Inputs, Level 1 [Member] | Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
United States [Member] | Fair Value, Inputs, Level 1 [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
United States [Member] | Fair Value, Inputs, Level 1 [Member] | Other Commingled Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0
United States [Member] | Fair Value, Inputs, Level 1 [Member] | Other funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0
United States [Member] | Fair Value, Inputs, Level 1 [Member] | Total [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	27		20
United States [Member] | Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		8
United States [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
United States [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	132		127
United States [Member] | Fair Value, Inputs, Level 2 [Member] | Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	7		12
United States [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	22		19
United States [Member] | Fair Value, Inputs, Level 2 [Member] | Mortgage Backed Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	10		6
United States [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities and Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	22		22
United States [Member] | Fair Value, Inputs, Level 2 [Member] | Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	63		61
United States [Member] | Fair Value, Inputs, Level 2 [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
United States [Member] | Fair Value, Inputs, Level 2 [Member] | Other Commingled Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0
United States [Member] | Fair Value, Inputs, Level 2 [Member] | Other funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0
United States [Member] | Fair Value, Inputs, Level 2 [Member] | Total [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	256		255
United States [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	16		14		12
United States [Member] | Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
United States [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
United States [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
United States [Member] | Fair Value, Inputs, Level 3 [Member] | Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
United States [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
United States [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgage Backed Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
United States [Member] | Fair Value, Inputs, Level 3 [Member] | Asset-backed Securities and Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
United States [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
United States [Member] | Fair Value, Inputs, Level 3 [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	16		14		12
United States [Member] | Fair Value, Inputs, Level 3 [Member] | Other Commingled Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0
United States [Member] | Fair Value, Inputs, Level 3 [Member] | Other funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0
United States [Member] | Fair Value, Inputs, Level 3 [Member] | Total [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	16		14
Foreign Pension Plan, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	590		135		126
Foreign Pension Plan, Defined Benefit [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	7		3
Foreign Pension Plan, Defined Benefit [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
Foreign Pension Plan, Defined Benefit [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	163		82
Foreign Pension Plan, Defined Benefit [Member] | Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	4		0
Foreign Pension Plan, Defined Benefit [Member] | Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	242		9
Foreign Pension Plan, Defined Benefit [Member] | Mortgage Backed Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
Foreign Pension Plan, Defined Benefit [Member] | Asset-backed Securities and Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
Foreign Pension Plan, Defined Benefit [Member] | Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	45		36
Foreign Pension Plan, Defined Benefit [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	26		5
Foreign Pension Plan, Defined Benefit [Member] | Other Commingled Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	52
Foreign Pension Plan, Defined Benefit [Member] | Other funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	51
Foreign Pension Plan, Defined Benefit [Member] | Total [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	590		135
Foreign Pension Plan, Defined Benefit [Member] | Receivables [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0	[1]	0	[2]
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	7		3
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	6		0
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	4		0
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	6		0
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Mortgage Backed Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Asset-backed Securities and Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Other Commingled Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	3
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Other funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member] | Total [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	26		3
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	157		82
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	236		9
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Mortgage Backed Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities and Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	45		36
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	19		0
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Other Commingled Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	49
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Other funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	46
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member] | Total [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	552		127
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	12		5		5
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Government Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate Bonds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Mortgage Backed Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Asset-backed Securities and Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0		0
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	7		5		5
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Other Commingled Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	0
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Other funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	5
Foreign Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member] | Total [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension Plan Assets	$ 12		$ 5

[1] Represents pending trades at March 31, 2014.

[2] Represents pending trades at March 31, 2013.