Borrowing Facilities and Debt (Details Textual) - USD ($)	1 Months Ended
	Nov. 30, 2015	Jul. 31, 2016	Oct. 25, 2015	Sep. 30, 2015
Line of Credit Facility [Line Items]
Available revolving credit agreement		$ 1,600,000,000.0
Outstanding credit facilities		0	$ 0
Notes payable, short-term		0	1,200,000,000
Revolving Credit [Member]
Line of Credit Facility [Line Items]
Available revolving credit agreement		1,500,000,000.0
Foreign Line of Credit [Member]
Line of Credit Facility [Line Items]
Available revolving credit agreement		76,000,000
2.650% Unsecured Senior Notes Due 2016 [Member] | Senior Notes [Member]
Line of Credit Facility [Line Items]
Extinguishment of debt, amount	$ 405,000,000
Loss on extinguishment of debt	$ 5,000,000
Other Debt [Member]
Line of Credit Facility [Line Items]
Notes payable, short-term		0	800,000,000
Senior Notes [Member]
Line of Credit Facility [Line Items]
Long-term debt, principal amount		3,350,000,000	3,350,000,000	$ 1,800,000,000
Senior Notes [Member] | 2.650% Unsecured Senior Notes Due 2016 [Member]
Line of Credit Facility [Line Items]
Notes payable, short-term		$ 0	$ 400,000,000
Stated interest rate (as percent)		2.65%	2.65%