Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Nov. 30, 2014	Nov. 30, 2013	Nov. 30, 2014	Nov. 30, 2013
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance			$ (65)
Translation adjustment	(119)	44	(148)	(34)
Amortization of unrealized pension actuarial gains/losses and other, net of tax of $0, $0, $1 and $1	1	2	2	3
Ending balance	(211)	(67)	(211)	(67)
Foreign currency translation gain (loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	38	12	67	90
Translation adjustment	(119)	44	(148)	(34)
Ending balance	(81)	56	(81)	56
Retirement plans adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(131)	(125)	(132)	(126)
Reclassification from AOCI	1	2	2	3
Ending balance	$ (130)	$ (123)	$ (130)	$ (123)

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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