Financial Guarantees and Warranties (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2011 Agreements
Guarantor Obligations [Line Items]
Number of software customer agreement to secure standby financing	1
Standby Letters of Credit and Surety Bonds [Member]
Guarantor Obligations [Line Items]
Guarantee Obligations Maximum Exposure	$ 121
Guarantee Obligations - Inventory Repurchase Guarantees [Member]
Guarantor Obligations [Line Items]
Guarantee Obligations Maximum Exposure	142
Guarantee Obligations - Inventory Repurchase Guarantees [Member] | Maximum [Member]
Guarantor Obligations [Line Items]
Number of years for which inventory repurchase agreements extend	P2Y
Guarantee Obligations - Inventory Repurchase Guarantees [Member] | Minimum [Member]
Guarantor Obligations [Line Items]
Number of years for which inventory repurchase agreements extend	P1Y
Other Customer Guarantees [Member]
Guarantor Obligations [Line Items]
Guarantee Obligations Maximum Exposure	$ 42