Summary of the Purchase Price Allocation (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011		Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Marketing-related	Dec. 31, 2011 Contract-based	Dec. 31, 2011 Customer-related	Nov. 01, 2009 Zappos.com, Inc	Nov. 01, 2009 Zappos.com, Inc Marketing-related		Nov. 01, 2009 Zappos.com, Inc Contract-based		Nov. 01, 2009 Zappos.com, Inc Customer-related
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Goodwill	$ 615		$ 111	$ 16				$ 778
Other net assets acquired								83
Deferred tax liabilities net	(75)							(167)
Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net	771							1,134
Intangible assets	$ 230	[1]	$ 91	$ 5	$ 130	$ 6	$ 94		$ 223	[2]	$ 103	[2]	$ 114	[2]

[1] Amortization periods range from 2 to 10 years, with a weighted-average amortization period of 8 years.

[2] Acquired intangible assets have estimated useful lives of between 1 and 10 years.