Valuation And Qualifying Accounts (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Valuation and Qualifying Accounts [Abstract]
Balance at beginning of period	$ 2	$ 2	$ 3
Additions charged to costs and expenses	1	1	2
Deductions	1	1	3
Balance at end of period	$ 2	$ 2	$ 2