Segment Information (Schedule Of Long-Lived Assets By Geographic Area) (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Revenues From External Customers And Long-Lived Assets [Line Items]
Long-lived assets by geographic area	$ 980	$ 918
United States
Revenues From External Customers And Long-Lived Assets [Line Items]
Long-lived assets by geographic area	834	801
International
Revenues From External Customers And Long-Lived Assets [Line Items]
Long-lived assets by geographic area	$ 146	$ 117