Other Assets And Liabilities (Other Current Assets) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Other Assets And Liabilities [Abstract]
Other receivables	$ 35	$ 36
Prepaid expenses	22	22
Certificates of deposit	27	27
Other current assets	2	2
Total other current assets	$ 86	$ 87