Allocation of Aggregate Purchase Price of Acquisitions (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2010	Dec. 31, 2011 Series of Individually Immaterial Business Acquisitions		Dec. 31, 2011 Series of Individually Immaterial Business Acquisitions Marketing-related		Dec. 31, 2011 Series of Individually Immaterial Business Acquisitions Contract-based		Dec. 31, 2011 Series of Individually Immaterial Business Acquisitions Customer-related		Dec. 31, 2012 Kiva Systems, Inc	May 31, 2012 Kiva Systems, Inc	Dec. 31, 2012 Kiva Systems, Inc Marketing-related		Dec. 31, 2012 Kiva Systems, Inc Contract-based		Dec. 31, 2012 Kiva Systems, Inc Technology Based		Dec. 31, 2012 Kiva Systems, Inc Customer-related
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]
Cash paid, net of cash acquired		$ 637								$ 613
Stock options assumed		20								65
Business acquisition, purchase price	228	771								678	678
Goodwill	111	615								560
Intangible assets		230		130	[1]	6	[1]	94	[1]	193		5	[2]	3	[2]	168	[2]	17	[2]
Property and equipment		119								9
Deferred tax assets		49								34
Other assets acquired		68								41
Deferred tax liabilities		(75)								(81)
Other liabilities assumed		(100)	[3]							(78)
Existing equity interest		89
Indemnification holdbacks		25
Accounts payable		(65)
Debt		$ (70)

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

[2] Acquired intangible assets have estimated useful lives of between four and 10 years, with a weighted-average amortization period of five years.

[3] Includes a $38 million contingent liability related to historic tax exposures.