Equity-Method Investments Summarized Condensed Financial Information of LivingSocial (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended
	Jan. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Operations:
Revenue		$ 231	$ 302	$ 347
Gross profit		194	253	280
Operating expenses		296	282	367
Operating loss from continuing operations		(102)	(29)	(87)
Net loss from continuing operations		(73)	(16)	(79)
Net income (loss) from discontinued operations, net of tax		173	(156)	(574)
Net income (loss)		100	(172)	(653)
Sale of Korean operations	260
Gain on disposal of Korean operations	205
Balance Sheet:
Current assets		163	182
Non-current assets		29	61
Current liabilities		137	301
Non-current liabilities		34	33
Redeemable stock		$ 366	$ 315