Debt and Financing Costs (Details Textuals) (USD $)	1 Months Ended		9 Months Ended
	Aug. 31, 2016	May 31, 2013	Sep. 30, 2011	Dec. 31, 2010	Sep. 30, 2011 Commercial Paper Program Maximum Amount [Member]	Sep. 30, 2011 Notes Payable, Other Payables [Member]	May 31, 2013 Unsecured Committed Bank Credit Facilities [Member]	Sep. 30, 2011 Unsecured Committed Bank Credit Facilities [Member]	Aug. 31, 2011 Unsecured Committed Bank Credit Facilities [Member]	Sep. 30, 2011 Unsecured Committed Bank Credit Facilities in U.S. [Member]	Sep. 30, 2011 Unsecured Committed Bank Credit Facilities in Australia [Member]	Sep. 30, 2011 Unsecured Committed Bank Credit Facilities in Canada [Member]
Short-term Debt [Line Items]
Commercial paper program					$ 2,950,000,000
Period For Borrowing Funds			270 days
Short term debt borrowings						400,000,000
Line of Credit Facility [Line Items]
Unsecured credit facility available to Company							2,300,000,000	3,300,000,000	1,000,000,000
Revolving bank facility								1,500,000,000		450,000,000	200,000,000	150,000,000
Borrowed on uncommitted overdraft lines			17,000,000	46,000,000
Line of Credit Facility, Remaining Borrowing Capacity			3,300,000,000
Line of credit facility, expiration date			P5Y
Debt and Financing Costs (Textuals) [Abstract]
Maturing date of credit facilities	Aug. 31, 2016	May 31, 2013
Carrying Amount, Commercial paper			$ 0	$ 913,000,000
Period For Borrowing Funds			270 days
Short-term debt, terms			6.25 percent notes due within the next 12 months