Retirement Plans (Details 6) (USD $) In Millions, unless otherwise specified	12 Months Ended
May 31, 2014	May 31, 2013	May 31, 2012
Change in Plan Assets
Ending balance May 31	$ 21,444	$ 19,047
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation ("ABO")	23,805	21,958
Changes in Projected Benefit Obligation ("PBO") and Accumulated Postretirement Benefit Obligation ("APBO")
PBO/APBO at the beginning of year	22,600	22,187
Service cost	657	692	593
Interest cost	1,055	968	976
Actuarial (gain) loss	1,021	(652)
Benefits paid	(801)	(589)
Other	46	(6)
PBO/APBO at the end of year	24,578	22,600	22,187
Change in Plan Assets
Beginning balance May 31	19,433	17,334
Actual return on plan assets	2,509	2,081
Company contributions	727	615
Benefits paid	(801)	(589)
Other	39	(8)
Ending balance May 31	21,907	19,433	17,334
Funded Status of the Plans	(2,671)	(3,167)
Amount Recognized in the Balance Sheet at May 31
Noncurrent asset	5
Current pension, postretirement healthcare and other benefit obligations	(41)	(48)
Noncurrent pension, postretirement healthcare and other benefit obligations	(2,635)	(3,119)
Net amount recognized	(2,671)	(3,167)
Amounts Recognized in AOCI and not yet reflected in Net Periodic Benefit Cost
Net actuarial loss (gain)	6,633	6,993
Prior service (credit) cost and other	(670)	(781)
Total	5,963	6,212
Defined Benefit Plan Amounts That Will Be Amortized From Accumulated Other Comprehensive Income Loss In Next Fiscal Year Abstract
Net actuarial loss (gain)	300	378
Prior service credit and other	(115)	(114)
Total	185	264
Postretirement Healthcare Plans [Member]
Changes in Projected Benefit Obligation ("PBO") and Accumulated Postretirement Benefit Obligation ("APBO")
PBO/APBO at the beginning of year	828	790
Service cost	38	42	35
Interest cost	40	36	36
Actuarial (gain) loss	5	(17)
Benefits paid	(62)	(54)
Other	34	31
PBO/APBO at the end of year	883	828	790
Change in Plan Assets
Company contributions	28	27
Benefits paid	(62)	(54)
Other	34	27
Funded Status of the Plans	(883)	(828)
Amount Recognized in the Balance Sheet at May 31
Current pension, postretirement healthcare and other benefit obligations	(41)	(39)
Noncurrent pension, postretirement healthcare and other benefit obligations	(842)	(789)
Net amount recognized	(883)	(828)
Amounts Recognized in AOCI and not yet reflected in Net Periodic Benefit Cost
Net actuarial loss (gain)	2	(4)
Prior service (credit) cost and other	1	2
Total	$ 3	$ (2)

The amount of other changes during the year that impacted the plan assets balance.

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For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

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The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes 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.

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Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

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The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

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The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total.

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Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation).

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The amount for overfunded plans recognized in the balance sheet as a noncurrent asset associated with a defined benefit pension plan or other postretirement defined benefit plan.

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1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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The increase in the fair value of plan assets from contributions made by the employer.

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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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The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

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Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.

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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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Changes in the defined benefit obligation, not otherwise separately disclosed in the financial statements.

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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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For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan.

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This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans.

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