Basis Of Presentation And Recently Issued Accounting Pronouncements (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Organization And Summary Of Significant Accounting Policies [Line Items]
Net unrealized gain or loss on foreign-currency transactions of intercompany loan hedges	$ 4	$ 6