Long-Term Debt and Short-Term Borrowings (Details 1)		1 Months Ended				1 Months Ended		9 Months Ended
	Jun. 30, 2014 USD ($)	Jun. 30, 2014 Fixed rate medium term note due 2019 USD ($)	Jun. 30, 2014 Fixed rate medium term note due 2044 USD ($)	Jul. 31, 2014 Eurobond notes which matured in 2014 EUR (€)	Sep. 30, 2014 Eurobond notes which matured in 2014 EUR (€)	Aug. 31, 2014 Five-year credit facility agreement USD ($)	Sep. 30, 2012 Five-year credit facility agreement USD ($)	Sep. 30, 2014 Five-year credit facility agreement
Long-Term Debt
Repayment of debt				€ 1,025,000,000
Term of debt instrument		5 years	30 years
Medium-term notes program established in connection with a "well-known seasoned issuer" shelf registration	9,000,000,000
Principal amount		625,000,000	325,000,000		1,025,000,000
Amount of notes under medium term note program that were previously issued	2,250,000,000
Interest rate, stated percentage (as a percent)		1.625%	3.875%
Derivative notional amount		600,000,000
Line of Credit Facility
Term of credit facility						5 years	5 years
Current borrowing capacity						2,250,000,000	1,500,000,000
Maximum increase available subject to lender approval						2,250,000,000
Maximum borrowing capacity including portion subject to lender approval						$ 4,500,000,000
Required minimum EBITDA to Interest Ratio								3
Actual EBITDA to Interest Ratio								59
Number of consecutive quarters over which the ratio of required EBITDA to Interest Ratio is calculated								4