Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Components Of Deferred Income Tax Assets And Liabilities [Line Items]
Increase in deferred tax assets due to increase in valuation allowance	$ 129
Deferred tax assets, foreign net operating loss carryforwards	74
Deferred tax assets, related to current year internal intangible assets	55
Increase in deferred tax assets due to increase in valuation allowance	$ 129