Pension and Other Postretirement Benefits (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
Apr. 30, 2011	Apr. 30, 2010	Apr. 30, 2009
Pension Benefits [Member]
Postretirement medical and life insurance benefit expense
Service cost	$ 16	$ 10	$ 13
Interest cost	33	32	30
Net expense	33	13	16
Amounts recognized in other comprehensive income
Prior service cost			1
Actuarial (gain) loss	(18)	100	92
Amortization reclassified to net income:
Prior service cost	(1)	(1)	(1)
Net actuarial loss	(18)	(4)	(6)
Net amount recognized in other comprehensive income	(37)	95	86
Assumptions used in computing benefit plan obligations
Discount rate	5.67%	5.91%
Rate of salary increase	4.00%	4.00%
Assumptions used in computing benefit plan expense
Discount rate	5.91%	7.94%	6.87%
Rate of salary increase	4.00%	4.00%	4.00%
Expected return on plan assets	8.50%	8.50%	8.75%
Medical and Life Insurance Benefits [Member]
Postretirement medical and life insurance benefit expense
Service cost	1	1	1
Interest cost	3	3	3
Net expense	4	4	4
Amounts recognized in other comprehensive income
Prior service cost	5
Actuarial (gain) loss	(10)	12	(9)
Amortization reclassified to net income:
Net amount recognized in other comprehensive income	$ (5)	$ 12	$ (9)
Assumptions used in computing benefit plan obligations
Discount rate	5.59%	5.78%
Assumptions used in computing benefit plan expense
Discount rate	5.78%	7.80%	6.87%
Assumed health care cost trend rates
Present rate before age 65	7.50%	8.00%
Present rate age 65 and after	7.50%	8.00%

Amortization reclassified to net income.

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Health care cost trend rate assumed for next year, Present rate age sixty five and after.

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Health care cost trend rate assumed for next year, Present rate before age sixty five.

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Postretirement Medical And Life Insurance Benefit Expense Abstract.

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The interest rate used to adjust for the time value of money for the plan.

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Expected rate of compensation increases (for pay-related plans).

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The interest rate used to adjust for the time value of money.

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An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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Expected rate of compensation increases (for pay-related plans).

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The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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The change in other comprehensive income due to the amortization of the net prior service costs (credit) into net periodic pension costs.

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The pretax cost (credit) of benefit changes attributable to plan participants' prior service resulting from a plan amendment or plan initiation that occurred during the period. The cost has not yet been recognized in net periodic benefit cost. A plan amendment includes provisions that grant increased (decreased) benefits based on service rendered in prior periods.

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Amounts recognized in other comprehensive income (but not yet recognized in net periodic benefit cost), including the net gain (loss) and net prior service cost (credit) arising during the period. Also includes reclassification adjustments out of other comprehensive income as a result of being recognized as components of net periodic benefit cost for the period. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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Pretax change in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan, that has not been recognized in net periodic benefit cost.

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The net gain (loss) previously recognized in other comprehensive income that is a reclassification adjustment of other comprehensive income as a result of being recognized as a component of net periodic benefit cost for the period.

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