Derivatives And Other Financial Instruments (Summary Of Fair Value Hedges Outstanding) (Details) (USD $)	6 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Notional Amount of Underlying Debt	$ 1,500,000,000	$ 1,500,000,000
Notes 3.50% Due 2014 [Member]
Interest rate on associated notes	3.50%
Notional Amount of Underlying Debt	500,000,000	500,000,000
Percent added to LIBOR to reach Variable Rate Paid	0.89%
Variable Rate Paid	1 month U.S. $ LIBOR + 0.890%
Year of Transaction	2009
Maturity Date	Nov. 01, 2014
Fair Value	$ 23,900,000