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Derivative Financial Instruments and Hedging Activities (Tables)
 9 Months Ended
Jan. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Derivative Instruments, Gain (Loss) [Table Text Block]
The following tables present the pre-tax impact that changes in the fair value of our derivative instruments and non-derivative hedging instruments had on AOCI and earnings:
 
 
Three Months Ended
 
 
January 31,
(Dollars in millions)
Classification
2018
 
2019
Derivative Instruments
 
 
 
 
Currency derivatives designated as cash flow hedges:
 
 

 
 

Net gain (loss) recognized in AOCI
n/a
$
(51
)
 
$
(5
)
Net gain (loss) reclassified from AOCI into earnings
Sales
(1
)
 
5

Currency derivatives not designated as hedging instruments:
 
 

 
 

Net gain (loss) recognized in earnings
Sales
(5
)
 
(1
)
Net gain (loss) recognized in earnings
Other income
3

 
6

Non-Derivative Hedging Instruments
 
 
 
 
Foreign currency-denominated debt designated as net investment hedge:
 
 
 
 
Net gain (loss) recognized in AOCI
n/a
(42
)
 
(11
)
Foreign currency-denominated debt not designated as hedging instrument:
 
 
 
 
Net gain (loss) recognized in earnings
Other income
(9
)
 
(1
)
 
 
 
 
 
 
 
Nine Months Ended
 
 
January 31,
(Dollars in millions)
Classification
2018
 
2019
Derivative Instruments
 
 
 
 
Currency derivatives designated as cash flow hedges:
 
 

 
 

Net gain (loss) recognized in AOCI
n/a
$
(80
)
 
$
51

Net gain (loss) reclassified from AOCI into earnings
Sales
(4
)
 
3

Currency derivatives not designated as hedging instruments:
 
 

 
 

Net gain (loss) recognized in earnings
Sales
(8
)
 
5

Net gain (loss) recognized in earnings
Other income
8

 
4

Non-Derivative Hedging Instruments
 
 
 
 
Foreign currency-denominated debt designated as net investment hedge:
 
 
 
 
Net gain (loss) recognized in AOCI
n/a
(57
)
 
36

Foreign currency-denominated debt not designated as hedging instrument:
 
 
 
 
Net gain (loss) recognized in earnings
Other income
(24
)
 
7
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
The following table presents the fair values of our derivative instruments:

(Dollars in millions)


Classification
 
Fair value of derivatives in a gain position
 
Fair value of derivatives in a
loss position
April 30, 2018
 
 
 
 
 
Designated as cash flow hedges:
 
 
 
 
 
Currency derivatives
Other current assets
 
$
2

 
$
(2
)
Currency derivatives
Other assets
 
1

 
—

Currency derivatives
Accrued expenses
 
4

 
(23
)
Currency derivatives
Other liabilities
 
2

 
(18
)
Not designated as hedges:
 
 
 
 
 
Currency derivatives
Other current assets
 
—

 
—

Currency derivatives
Accrued expenses
 
1

 
(5
)
January 31, 2019
 
 
 
 
 
Designated as cash flow hedges:
 
 
 
 
 
Currency derivatives
Other current assets
 
13

 
(3
)
Currency derivatives
Other assets
 
14

 
(2
)
Currency derivatives
Accrued expenses
 
2

 
(5
)
Currency derivatives
Other liabilities
 
—

 
—

Not designated as hedges:
 
 
 
 
 
Currency derivatives
Other current assets
 
2

 
—

Currency derivatives
Accrued expenses
 
—

 
—
Offsetting Derivative Assets and Liabilities [Table Text Block]
The following table summarizes the gross and net amounts of our derivative contracts:
(Dollars in millions)
Gross Amounts of Recognized Assets (Liabilities)
 
Gross Amounts Offset in Balance Sheet
 
Net Amounts Presented in Balance Sheet
 
Gross Amounts Not Offset in Balance Sheet
 
Net Amounts
April 30, 2018
 
 
 
 
 
 
 
 
 
Derivative assets
$
10

 
$
(9
)
 
$
1

 
$
(1
)
 
$
—

Derivative liabilities
(48
)
 
9

 
(39
)
 
1

 
(38
)
January 31, 2019
 
 
 
 
 
 
 
 
 
Derivative assets
31

 
(7
)
 
24

 
(1
)
 
23

Derivative liabilities
(10
)
 
7

 
(3
)
 
1

 
(2
)