|
Total Stock-Based Compensation Expense (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
May 31, 2012
|
May 31, 2011
|
May 31, 2010
|
|
| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | |||
| Accelerated stock option expense | $ 17 | $ 12 | $ 74 |