Equity Method Investments - Additional Information (Detail) (LivingSocial, USD $)			3 Months Ended
	Dec. 31, 2013	Nov. 30, 2013	Mar. 31, 2013 Cost-method Investments [Member]	Dec. 31, 2013 Cost-method Investments [Member]
Schedule of Equity Method Investments [Line Items]
Equity investment, amount to be sold		$ 260,000,000
Equity investment, assets held-for-sale	146,000,000
Equity investment, liabilities of assets held-for-sale	122,000,000
Equity investment, book value	0			38,000,000
Investment in LivingSocial			$ 56,000,000
Equity investment, ownership percentage	31.00%