Comprehensive Income and Shareholders' (Deficit) Equity Accumulated Other Comprehensive Income Activity (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at year-end 2013	$ (44)
Other comprehensive income before reclassifications	3	[1]
Amounts reclassified from accumulated other comprehensive loss	2
Net other comprehensive income	5
Balance at June 30, 2014	(39)
Other comprehensive income (loss), before reclassifications, unrealized gains on available-for-sale securities, deferred tax	1
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at year-end 2013	(31)
Other comprehensive income before reclassifications	0	[1]
Amounts reclassified from accumulated other comprehensive loss	0
Net other comprehensive income	0
Balance at June 30, 2014	(31)
Other Derivative Instrument Adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at year-end 2013	(19)
Other comprehensive income before reclassifications	1	[1]
Amounts reclassified from accumulated other comprehensive loss	2
Net other comprehensive income	3
Balance at June 30, 2014	(16)
Unrealized Gains on Available-For-Sale Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at year-end 2013	6
Other comprehensive income before reclassifications	2	[1]
Amounts reclassified from accumulated other comprehensive loss	0
Net other comprehensive income	2
Balance at June 30, 2014	$ 8

[1] We present the portions of other comprehensive income before reclassifications for the 2014 first half that relate to unrealized gains on available-for-sale securities net of $1 million of deferred taxes.