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Fair Value Measurements - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
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Feb. 28, 2014
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Feb. 28, 2013
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Feb. 28, 2014
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Feb. 28, 2013
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May 31, 2013
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | |||||
| Available-for-sale securities with maturity dates within one year from purchase date | $ 2,303 | $ 2,303 | $ 2,229 | ||
| Available-for-sale securities with maturity dates over one year and less than five years from purchase date | 862 | 862 | 399 | ||
| Interest income related to cash and equivalents and short-term investments | 3 | 6 | 9 | 20 | |
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Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 2
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| Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] | |||||
| Fair value of long term debt | $ 1,131 | $ 1,131 | $ 1,219 | ||