Credit Facilities, Short-term Borrowings and Long-term Debt (Details Textual 1) (USD $)	Sep. 30, 2011	Sep. 30, 2011 Bank credit facility expiring November 16, 2012 [Member]	Nov. 30, 2011 Five-Year Credit Facility [Member]
Credit Facilities, Short-term Borrowings and Long-term Debt (Textuals)
Amount of facility	$ 1,500,000,000	$ 1,500,000,000	$ 500,000,000
Borrowings under revolving credit facility		0
Maturity period of facility			5 years
Secured long-term debt, including current maturities	$ 35,000