Financial Instruments (Net Unrealized Gains And (Losses) Related To Available For Sale Securities) (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Financial Instruments
Unrealized gains (pre-tax)		$ 1		$ 1
Unrealized losses (pre-tax)			$ (1)