Discontinued Operations - Operations Data for Discontinued Operations (Detail) (USD $) In Millions, unless otherwise specified	4 Months Ended	12 Months Ended
	May 05, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Discontinued Operations And Disposal Groups [Abstract]
Net revenue	$ 76
Operating expenses	86
Operating loss before income taxes	(10)
Benefit for income taxes	4
Loss from discontinued operations, net of tax	(6)			(6)
Gain from disposal of discontinued operations, net of tax of $0	312	4	7	312
Total income from discontinued operations, net of tax	$ 306	$ 4	$ 7