Organization And Summary Of Significant Accounting Policies (Summary Of Cash And Cash Equivalents) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Organization And Summary Of Significant Accounting Policies [Abstract]
Cash	$ 254	$ 15
Marketable securities	1,169
Total	$ 1,423	$ 15	$ 53	$ 23