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Accumulated Other Comprehensive Income (Tables)
 12 Months Ended
Apr. 30, 2018
Accumulated Other Comprehensive Income [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The following table summarizes the change in each component of AOCI, net of tax, during 2018:
 
Currency Translation Adjustments
 
Cash Flow Hedge Adjustments
 
Postretirement Benefits Adjustments
 
Total AOCI
Balance at April 30, 2017
$
(204
)
 
$
11

 
$
(197
)
 
$
(390
)
Net other comprehensive income (loss)
24

 
(28
)
 
16

 
12

Balance at April 30, 2018
$
(180
)
 
$
(17
)
 
$
(181
)
 
$
(378
)
Comprehensive Income (Loss) [Table Text Block]
The following table presents the components of net other comprehensive income (loss) during each of the last three years:
 
Pre-Tax
 
Tax
 
Net
Year Ended April 30, 2016
 
 
 
 
 
Currency translation adjustments:
 
 
 
 
 
Net gain (loss) on currency translation
$
(22
)
 
$
(1
)
 
$
(23
)
Reclassification to earnings
—

 
—

 
—

Other comprehensive income (loss), net
(22
)
 
(1
)
 
(23
)
Cash flow hedge adjustments:
 
 
 
 
 
Net gain (loss) on hedging instruments
30

 
(10
)
 
20

Reclassification to earnings1
(60
)
 
23

 
(37
)
Other comprehensive income (loss), net
(30
)
 
13

 
(17
)
Postretirement benefits adjustments:
 
 
 
 
 
Net actuarial gain (loss) and prior service cost
(47
)
 
19

 
(28
)
Reclassification to earnings2
30

 
(12
)
 
18

Other comprehensive income (loss), net
(17
)
 
7

 
(10
)
 
 
 
 
 
 
Total other comprehensive income (loss), net
$
(69
)
 
$
19

 
$
(50
)
 
 
 
 
 
 
Year Ended April 30, 2017
 
 
 
 
 
Currency translation adjustments:
 
 
 
 
 
Net gain (loss) on currency translation
$
(71
)
 
$
(4
)
 
$
(75
)
Reclassification to earnings
3

 
(1
)
 
2

Other comprehensive income (loss), net
(68
)
 
(5
)
 
(73
)
Cash flow hedge adjustments:
 
 
 
 
 
Net gain (loss) on hedging instruments
41

 
(17
)
 
24

Reclassification to earnings1
(40
)
 
16

 
(24
)
Other comprehensive income (loss), net
1

 
(1
)
 
—

Postretirement benefits adjustments:
 
 
 
 
 
Net actuarial gain (loss) and prior service cost
28

 
(10
)
 
18

Reclassification to earnings2
25

 
(10
)
 
15

Other comprehensive income (loss), net
53

 
(20
)
 
33

 
 
 
 
 
 
Total other comprehensive income (loss), net
$
(14
)
 
$
(26
)
 
$
(40
)
 
 
 
 
 
 
Year Ended April 30, 2018
 
 
 
 
 
Currency translation adjustments:
 
 
 
 
 
Net gain (loss) on currency translation
$
12

 
$
12

 
$
24

Reclassification to earnings
—

 
—

 
—

Other comprehensive income (loss), net
12

 
12

 
24

Cash flow hedge adjustments:
 
 
 
 
 
Net gain (loss) on hedging instruments
(54
)
 
18

 
(36
)
Reclassification to earnings1
11

 
(3
)
 
8

Other comprehensive income (loss), net
(43
)
 
15

 
(28
)
Postretirement benefits adjustments:
 
 
 
 
 
Net actuarial gain (loss) and prior service cost
5

 
(2
)
 
3

Reclassification to earnings2
20

 
(7
)
 
13

Other comprehensive income (loss), net
25

 
(9
)
 
16

 
 
 
 
 
 
Total other comprehensive income (loss), net
$
(6
)
 
$
18

 
$
12

1Pre-tax amount is classified as sales in the accompanying consolidated statements of operations.
2Pre-tax amount is a component of pension and other postretirement benefit expense (as shown in Note 8, except for amounts related to non-U.S. benefit plans, about which no information is presented in Note 8 due to immateriality).