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Long-term Debt and Other Financing Arrangements (Details 1) (USD $)
In Millions, unless otherwise specified
12 Months Ended
May 31, 2013
May 31, 2012
Debt Instrument [Line Items]    
Capital lease obligations $ 11 $ 128
Total Debt And Capital Lease Obligations 2,990 1,667
Less current portion 251 417
LONG-TERM DEBT, LESS CURRENT PORTION 2,739 1,250
Senior Unsecured Debt Due In 2013 9.65% [Member]
   
Debt Instrument [Line Items]    
Long Term Debt   300
Debt Instrument Interest Rate Stated Percentage 9.65% 9.65%
Debt Instrument, Maturity Date   Jun. 15, 2012
Senior Unsecured Debt Due In 2014 7.38% [Member]
   
Debt Instrument [Line Items]    
Long Term Debt 250 250
Debt Instrument Interest Rate Stated Percentage 7.38% 7.38%
Debt Instrument, Maturity Date Jan. 15, 2014 Jan. 15, 2014
Senior Unsecured Debt Due 2019 8.00% [Member]
   
Debt Instrument [Line Items]    
Long Term Debt 750 750
Debt Instrument Interest Rate Stated Percentage 8.00% 8.00%
Debt Instrument, Maturity Date Jan. 15, 2019 Jan. 15, 2019
Senior Unsecured Debt Due 2023 2.625% [Member]
   
Debt Instrument [Line Items]    
Long Term Debt 499  
Debt Instrument Interest Rate Stated Percentage 2.625%  
Debt Instrument, Maturity Date Aug. 01, 2022  
Senior Unsecured Debt Due 2023 2.70% [Member]
   
Debt Instrument [Line Items]    
Long Term Debt 249  
Debt Instrument Interest Rate Stated Percentage 2.70%  
Debt Instrument, Maturity Date Apr. 15, 2023  
Senior Unsecured Debt Due 2043 3.875% [Member]
   
Debt Instrument [Line Items]    
Long Term Debt 493  
Debt Instrument Interest Rate Stated Percentage 3.875%  
Debt Instrument, Maturity Date Aug. 01, 2042  
Senior Unsecured Debt Due 2043 4.10% [Member]
   
Debt Instrument [Line Items]    
Long Term Debt 499  
Debt Instrument Interest Rate Stated Percentage 4.10%  
Debt Instrument, Maturity Date Apr. 15, 2043  
Senior Unsecured Debt Due 2098 7.60% [Member]
   
Debt Instrument [Line Items]    
Long Term Debt 239 239
Debt Instrument Interest Rate Stated Percentage 7.60% 7.60%
Debt Instrument, Maturity Date Jul. 01, 2097 Jul. 01, 2097
Total Senior Unsecured Debt [Member]
   
Debt Instrument [Line Items]    
Long Term Debt $ 2,979 $ 1,539