Acquisitions and Discontinued Operations - Schedule of Change in Fair Value of Level 3 Victory Seller Note (Detail) (Level 3 [Member], Seller Note [Member], USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Level 3 [Member] | Seller Note [Member]
Changes In Level 3 Assets And Liabilities Measured At Fair Value On Recurring Basis [Line Items]
Beginning Balance
Gains (losses) recognized in earnings	(1)
Purchases
Sales
Issuances	32
Settlements
Ending Balance	$ 31