Financial Guarantees and Warranties (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2013
Guarantor Obligations [Line Items]
Guarantee obligations, expiring in 2014	$ 121
Guarantee obligations, expiring in 2015	35
Guarantee obligations, expiring in 2016	3
Guarantee obligations, expiring in 2017	1
Guarantee obligations, expiring in 2018	0
Guarantee obligations, expiring after 2018	48
Guarantee Obligations - Inventory Repurchase Guarantees [Member]
Guarantor Obligations [Line Items]
Guarantor obligations, maximum exposure	155
Guarantee Obligations - Inventory Repurchase Guarantees [Member] | Minimum [Member]
Guarantor Obligations [Line Items]
Number of years for which agreements or guarantees extend	P1Y
Guarantee Obligations - Inventory Repurchase Guarantees [Member] | Maximum [Member]
Guarantor Obligations [Line Items]
Number of years for which agreements or guarantees extend	P2Y
Other Customer Guarantees [Member]
Guarantor Obligations [Line Items]
Guarantor obligations, maximum exposure	53
Other Customer Guarantees [Member] | Minimum [Member]
Guarantor Obligations [Line Items]
Number of years for which agreements or guarantees extend	P1Y
Other Customer Guarantees [Member] | Maximum [Member]
Guarantor Obligations [Line Items]
Number of years for which agreements or guarantees extend	P5Y
Standby Letters Of Credit And Surety Bonds [Member]
Guarantor Obligations [Line Items]
Guarantor obligations, maximum exposure	98
Guarantee Obligations Therapy Center [Member]
Guarantor Obligations [Line Items]
Guarantor obligations, maximum exposure	$ 72