Financial Guarantees And Warranties (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2012 customer
Guarantor Obligations [Line Items]
Number of software customer agreements to secure standby financing	1
Guarantee obligations, expiring in 2013	$ 107
Guarantee obligations, expiring in 2014	22
Guarantee obligations, expiring in 2015	13
Guarantee obligations, expiring in 2016	2
Guarantee obligations, expiring in 2017	1
Guarantee obligations, expiring after 2017	21
Standby Letters Of Credit And Surety Bonds [Member]
Guarantor Obligations [Line Items]
Guarantee obligations, maximum exposure	86
Guarantee Obligations - Inventory Repurchase Guarantees [Member]
Guarantor Obligations [Line Items]
Guarantee obligations, maximum exposure	125
Other Customer Guarantees [Member]
Guarantor Obligations [Line Items]
Guarantee obligations, maximum exposure	$ 41
Maximum [Member] | Guarantee Obligations - Inventory Repurchase Guarantees [Member]
Guarantor Obligations [Line Items]
Number of years for which inventory repurchase agreements extend	P2Y
Maximum [Member] | Other Customer Guarantees [Member]
Guarantor Obligations [Line Items]
Number of years for which inventory repurchase agreements extend	P5Y
Minimum [Member] | Guarantee Obligations - Inventory Repurchase Guarantees [Member]
Guarantor Obligations [Line Items]
Number of years for which inventory repurchase agreements extend	P1Y
Minimum [Member] | Other Customer Guarantees [Member]
Guarantor Obligations [Line Items]
Number of years for which inventory repurchase agreements extend	P1Y