Quarterly report pursuant to Section 13 or 15(d)

Short-term Financing (Lines of Credit Facility Amount Available) (Details)

v3.7.0.1
Short-term Financing (Lines of Credit Facility Amount Available) (Details)
$ in Millions
 9 Months Ended
Feb. 28, 2017
USD ($)
JP Morgan Chase Bank, N.A. [Member]  
Line of Credit Facility [Line Items]  
Amount available $ 350
Expiration date Feb. 28, 2018
Bank of America, N.A. [Member]  
Line of Credit Facility [Line Items]  
Amount available $ 250
Expiration date Feb. 28, 2018
PNC Bank, National Association [Member]  
Line of Credit Facility [Line Items]  
Amount available $ 150
Expiration date Feb. 28, 2018
Wells Fargo Bank, National Association [Member]  
Line of Credit Facility [Line Items]  
Amount available $ 150
Expiration date Feb. 28, 2018