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Goodwill and Other Intangible Assets (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2011
Goodwill and Other Intangible Assets [Abstract]
Intangible assets amortization expense	$ 27	$ 18	$ 32
Finite Lived Intangible Assets [Line Items]
Net Book Value	$ 72	$ 34

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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