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Accumulated Other Comprehensive Income (Tables)
 3 Months Ended
Jul. 31, 2013
Accumulated Other Comprehensive Income [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The following table summarizes the changes in accumulated other comprehensive income (AOCI), net of tax, during the three months ended July 31, 2013:
(Dollars in millions)
Currency Translation Adjustments
 
Net Gain on Cash Flow Hedges
 
Postretirement Benefits Adjustments
 
Total
Balance at April 30, 2013
$
10

 
$
—

 
$
(221
)
 
$
(211
)
Other comprehensive income (loss) before reclassifications (a)
(12
)
 
7

 
—

 
(5
)
Amounts reclassified from AOCI
—

 
(1
)
 
5

 
4

Net other comprehensive income (loss)
(12
)
 
6

 
5

 
(1
)
Balance at July 31, 2013
$
(2
)
 
$
6

 
$
(216
)
 
$
(212
)
(a) Net of tax benefit (cost) of $0, $(3), and $0 related to currency translation adjustments, cash flow hedges, and postretirement benefits adjustments, respectively.
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
The following table presents further information about amounts reclassified from AOCI during the three months ended July 31, 2013:
 
 
Amount Reclassified from AOCI
 
Classification in Consolidated Statement of Operations
Net gain (loss) on cash flow hedges:
 
 
 
 
Currency derivatives
 
$
1

 
Net sales
 
 
—

 
Tax benefit (expense)
 
 
1

 
Net of tax
Amounts related to postretirement benefit plans:
 
 
 
 
Net actuarial gain (loss)
 
(8
)
(a) 
 
 
 
3

 
Tax benefit (expense)
 
 
(5
)
 
Net of tax
Total reclassifications
 
$
(4
)
 
Net of tax
(a) Amount is included in the net periodic benefit cost of pension and other postretirement benefits (as shown in Note 6).