Financial Guarantees And Warranties (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Sep. 30, 2011 years Cus
Number of software customer agreements to secure standby financing	1
Standby Letters Of Credit And Surety Bonds [Member]
Guarantee obligations, maximum exposure	$ 112
Guarantee Obligations - Inventory Repurchase Guarantees [Member]
Guarantee obligations, maximum exposure	136
Guarantee Obligations - Inventory Repurchase Guarantees [Member] | Maximum [Member]
Number of years for which inventory repurchase agreements extend	P2Y
Guarantee Obligations - Inventory Repurchase Guarantees [Member] | Minimum [Member]
Number of years for which inventory repurchase agreements extend	P1Y
Other Customer Guarantees [Member]
Guarantee obligations, maximum exposure	$ 39