Accumulated Other Comprehensive Income Schedule of Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jul. 31, 2014		Jul. 31, 2013
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	$ (16)		$ (12)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax	0		0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(16)		(12)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	5		10
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	(1)		(3)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	4		7
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	2	[1]	(1)	[1]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax	(1)	[1]	0	[1]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	1	[1]	(1)	[1]
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) and Net Prior Service Credit (Cost) Arising During Period, before Tax	0		0
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) and Net Prior Service Credit (Cost) Arising During Period, Tax	0		0
Other Comprehensive Income Defined Benefit Plan Actuarial Gain Loss And Net Prior Service Costs Credit Arising During Period Net Of Tax	0		0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Gain (Loss) and Net Prior Service Credit (Cost), before Tax	6	[2]	8	[2]
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net (Gain) Loss and Prior Service (Credit) Cost, Tax	(2)	[2]	(3)	[2]
Other Comprehensive Income Reclassification Of Actuarial Gain Loss And Prior Service Cost Net Of Tax	4	[2]	5	[2]
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	(3)		5
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent	(4)		(6)
Other Comprehensive Income (Loss), Net of Tax	$ (7)		$ (1)

[1] 1Pre-tax amount is classified as net sales in the accompanying consolidated statements of operations.

[2] 2Pre-tax amount is a component of pension and other postretirement benefit expense (as shown in Note 6).