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Pension and Other Postretirement Benefits (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Apr. 30, 2012	Apr. 30, 2011
Change in fair value of Level 3 Assets
Ending balance	$ 508	$ 467
Level 3 [Member]
Change in fair value of Level 3 Assets
Beginning balance	49	42
Return on assets held at end of year	2	4
Return on assets sold during year	1	(1)
Purchases and settlements	17	10
Sales and settlements	(2)	(6)
Ending balance	67	49
Real Estate funds [Member]
Change in fair value of Level 3 Assets
Ending balance	45	27
Real Estate funds [Member] \| Level 3 [Member]
Change in fair value of Level 3 Assets
Beginning balance	9	10
Return on assets held at end of year	3	2
Purchases and settlements	14
Sales and settlements		(3)
Ending balance	26	9
Hedge Funds [Member]
Change in fair value of Level 3 Assets
Ending balance	24	24
Hedge Funds [Member] \| Level 3 [Member]
Change in fair value of Level 3 Assets
Beginning balance	24	19
Return on assets held at end of year	(1)	1
Return on assets sold during year	1	(1)
Purchases and settlements		6
Sales and settlements		(1)
Ending balance	24	24
Private Equity [Member]
Change in fair value of Level 3 Assets
Ending balance	17	16
Private Equity [Member] \| Level 3 [Member]
Change in fair value of Level 3 Assets
Beginning balance	16	13
Return on assets held at end of year		1
Purchases and settlements	3	4
Sales and settlements	(2)	(2)
Ending balance	$ 17	$ 16

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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