Basis Of Presentation And Recently Issued Accounting Pronouncements (Narrative) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Organization And Summary Of Significant Accounting Policies [Line Items]
Net unrealized gain or loss on foreign-currency transactions of intercompany loan hedges	$ 3	$ 0	$ 12	$ 0