Long-Lived Assets by Geographic Area (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012		Dec. 31, 2011
Long-Lived Assets by Geographical Areas [Line Items]
Property and equipment	$ 2,105		$ 1,475
UNITED STATES
Long-Lived Assets by Geographical Areas [Line Items]
Property and equipment	1,978		1,444
Rest of World
Long-Lived Assets by Geographical Areas [Line Items]
Property and equipment	$ 127	[1]	$ 31	[1]

[1] No individual country exceeded 10% of our total long-lived assets for any period presented