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Financing Arrangements - Additional Information (Details) - USD ($)
9 Months Ended
Feb. 28, 2017
May 31, 2016
Financing Arrangements (Details) [Line Items]    
Line of Credit Facility, Expiration Date Nov. 13, 2020  
Financial Covenant Terms Ratio 350.00%  
Financial Covenant Compliance Ratio 190.00%  
Letters Of Credit Outstanding $ 317,000,000  
Commercial paper outstanding 0  
Long Term Debt Exclusive of Capital Leases Carrying Value 14,700,000,000 $ 13,700,000,000
Long Term Debt Exclusive Of Capital Leases Fair Value $ 15,200,000,000 $ 14,300,000,000
Long-term debt weighted average interest rate 3.60%  
Revolving Credit Facility [Member]    
Financing Arrangements (Details) [Line Items]    
Line of Credit Facility, Term 5 years  
Line Of Credit Facility Maximum Borrowing Capacity $ 1,750,000,000  
Letter of Credit [Member]    
Financing Arrangements (Details) [Line Items]    
Letter of Credit Maximum Sublimit Amount 500,000,000  
Letter of Credit Outstanding Sublimit Unused Amount 183,000,000  
Senior Unsecured Debt due March 2027 and January 2047 [Member]    
Financing Arrangements (Details) [Line Items]    
Senior Unsecured Debt Issued $ 1,200,000,000  
Senior Unsecured Debt, Frequency of Periodic Interest Payment semiannually  
3.30% Senior Unsecured Debt due March 2027 [Member]    
Financing Arrangements (Details) [Line Items]    
Senior Unsecured Debt Issued $ 450,000,000  
Senior Unsecured Debt, Fixed Interest Rate Percentage 3.30%  
Senior Unsecured Debt, Maturity Date Mar. 15, 2027  
4.40% Senior Unsecured Debt due January 2047 [Member]    
Financing Arrangements (Details) [Line Items]    
Senior Unsecured Debt Issued $ 750,000,000  
Senior Unsecured Debt, Fixed Interest Rate Percentage 4.40%  
Senior Unsecured Debt, Maturity Date Jan. 15, 2047