Financial Instruments (Net Unrealized Gains And (Losses) Related To Available For Sale Securities) (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Financial Instruments [Abstract]
Unrealized gains (pre-tax)				$ 1
Unrealized losses (pre-tax)			$ (1)