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Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Millions, unless otherwise specified
Aug. 31, 2013
May 31, 2013
Assets    
Derivative assets $ 209 $ 289
Fair Value, Measurements, Recurring
    
Assets    
Derivative assets 209 [1] 289 [2]
Available-for-sale securities 4,666 4,949
Total Assets 4,875 [1] 5,238 [2]
Liabilities    
Total Liabilities 33 [1] 34 [2]
Reduction in derivative assets and liabilities if netted 33 34
Fair Value, Measurements, Recurring | U.S. Treasury securities | Cash and equivalents
    
Assets    
Available-for-sale securities 601 425
Fair Value, Measurements, Recurring | U.S. Treasury securities | Short-term investments
    
Assets    
Available-for-sale securities 1,305 1,583
Fair Value, Measurements, Recurring | U.S. Agency securities | Cash and equivalents
    
Assets    
Available-for-sale securities   20
Fair Value, Measurements, Recurring | U.S. Agency securities | Short-term investments
    
Assets    
Available-for-sale securities 392 401
Fair Value, Measurements, Recurring | Commercial paper and bonds | Cash and equivalents
    
Assets    
Available-for-sale securities 559 1,035
Fair Value, Measurements, Recurring | Commercial paper and bonds | Short-term investments
    
Assets    
Available-for-sale securities 945 644
Fair Value, Measurements, Recurring | Money market funds | Cash and equivalents
    
Assets    
Available-for-sale securities 858 836
Fair Value, Measurements, Recurring | Non-marketable preferred stock | Other Assets
    
Assets    
Available-for-sale securities 6 5
Fair Value, Measurements, Recurring | Foreign exchange forwards and options | Other Assets
    
Assets    
Derivative assets 200 [1] 278
Fair Value, Measurements, Recurring | Foreign exchange forwards and options | Other Liabilities
    
Liabilities    
Derivative liabilities 33 [1] 34
Fair Value, Measurements, Recurring | Interest rate swap contracts | Other Assets
    
Assets    
Derivative assets 9 11
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 1
    
Assets    
Derivative assets 0 0
Available-for-sale securities 1,906 2,008
Total Assets 1,906 2,008
Liabilities    
Total Liabilities 0 0
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 1 | U.S. Treasury securities | Cash and equivalents
    
Assets    
Available-for-sale securities 601 425
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 1 | U.S. Treasury securities | Short-term investments
    
Assets    
Available-for-sale securities 1,305 1,583
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 1 | U.S. Agency securities | Cash and equivalents
    
Assets    
Available-for-sale securities   0
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 1 | U.S. Agency securities | Short-term investments
    
Assets    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 1 | Commercial paper and bonds | Cash and equivalents
    
Assets    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 1 | Commercial paper and bonds | Short-term investments
    
Assets    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 1 | Money market funds | Cash and equivalents
    
Assets    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 1 | Non-marketable preferred stock | Other Assets
    
Assets    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 1 | Foreign exchange forwards and options | Other Assets
    
Assets    
Derivative assets 0 0
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 1 | Foreign exchange forwards and options | Other Liabilities
    
Liabilities    
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 1 | Interest rate swap contracts | Other Assets
    
Assets    
Derivative assets 0 0
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 2
    
Assets    
Derivative assets 209 289
Available-for-sale securities 2,754 2,936
Total Assets 2,963 3,225
Liabilities    
Total Liabilities 33 34
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 2 | U.S. Treasury securities | Cash and equivalents
    
Assets    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 2 | U.S. Treasury securities | Short-term investments
    
Assets    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 2 | U.S. Agency securities | Cash and equivalents
    
Assets    
Available-for-sale securities   20
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 2 | U.S. Agency securities | Short-term investments
    
Assets    
Available-for-sale securities 392 401
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 2 | Commercial paper and bonds | Cash and equivalents
    
Assets    
Available-for-sale securities 559 1,035
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 2 | Commercial paper and bonds | Short-term investments
    
Assets    
Available-for-sale securities 945 644
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 2 | Money market funds | Cash and equivalents
    
Assets    
Available-for-sale securities 858 836
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 2 | Non-marketable preferred stock | Other Assets
    
Assets    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 2 | Foreign exchange forwards and options | Other Assets
    
Assets    
Derivative assets 200 278
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 2 | Foreign exchange forwards and options | Other Liabilities
    
Liabilities    
Derivative liabilities 33 34
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 2 | Interest rate swap contracts | Other Assets
    
Assets    
Derivative assets 9 11
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 3
    
Assets    
Derivative assets 0 0
Available-for-sale securities 6 5
Total Assets 6 5
Liabilities    
Total Liabilities 0 0
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 3 | U.S. Treasury securities | Cash and equivalents
    
Assets    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 3 | U.S. Treasury securities | Short-term investments
    
Assets    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 3 | U.S. Agency securities | Cash and equivalents
    
Assets    
Available-for-sale securities   0
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 3 | U.S. Agency securities | Short-term investments
    
Assets    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 3 | Commercial paper and bonds | Cash and equivalents
    
Assets    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 3 | Commercial paper and bonds | Short-term investments
    
Assets    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 3 | Money market funds | Cash and equivalents
    
Assets    
Available-for-sale securities 0 0
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 3 | Non-marketable preferred stock | Other Assets
    
Assets    
Available-for-sale securities 6 5
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 3 | Foreign exchange forwards and options | Other Assets
    
Assets    
Derivative assets 0 0
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 3 | Foreign exchange forwards and options | Other Liabilities
    
Liabilities    
Derivative liabilities 0 0
Fair Value, Measurements, Recurring | Fair Value Measurements Using Level 3 | Interest rate swap contracts | Other Assets
    
Assets    
Derivative assets $ 0 $ 0
[1] $33 million.
[2] $34 million.