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Financing Arrangements (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 3 Months Ended 3 Months Ended
Nov. 30, 2012
Nov. 30, 2012
May 31, 2012
Aug. 31, 2012
Senior Unsecured Debt Due In 2022 [Member]
Aug. 31, 2012
Senior Unsecured Debt Due In 2042 [Member]
Aug. 31, 2012
Total Senior Unsecured Debt [Member]
Aug. 31, 2012
Unsecured Debt Repaid in 2013 [Member]
Financing Arrangements (Details) [Line Items]              
Repayments Of 9.65% Unsecured Debt             $ 300
Repayments of Capital Lease Obligations 116            
Line Of Credit Facility Maximum Borrowing Capacity 1,000 1,000          
Line Of Credit Facility Current Borrowing Capacity 1,000 1,000          
Long Term Debt Exclusive of Capital Leases Carrying Value 2,200 2,200 1,500        
Long Term Debt Exclusive Of Capital Leases Fair Value 2,600 2,600 2,000        
Senior Unsecured Debt Issued       $ 500 $ 500 $ 1,000  
Debt Instrument, Interest Rate, Stated Percentage       2.625% 3.875%   9.65%
Debt Instrument, Maturity Date       Aug. 01, 2022 Aug. 01, 2042   Jun. 15, 2012
Debt Instrument, Issuance Date       Jul. 27, 2012 Jul. 27, 2012    
Line of Credit Facility, Expiration Date   Apr. 26, 2016          
Line Of Credit Facility Covenant Terms Maximum Leverage Ratio   70%          
Line Of Credit Facility Covenant Terms Leverage Ratio   53%