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Acquisitions and Divestitures - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Acquisitions And Divestitures [Line Items]
Acquisitions of businesses / investments in affiliates	$ 304	$ 649	$ 148
Aggregate amount of goodwill arising from acquisitions	197	547
Aggregate amount of goodwill arising from acquisitions that is expected to be deductible for tax purposes	69	113
Aggregate amount allocated to other intangibles arising from acquisitions		133
Gain on sale of EIG			184
Net proceeds from sale of EIG			798
Tax payment related to sale of EIG			260
Savi Technology, Inc
Acquisitions And Divestitures [Line Items]
Deferred tax asset		66
Pacific Architects And Engineers Inc
Acquisitions And Divestitures [Line Items]
Deferred tax asset			182
Impairment charge			109
Enterprise Integration Group (EIG)
Acquisitions And Divestitures [Line Items]
Selling price of EIG per definitive agreement			815
Gain on sale of EIG			184
Gain on sale of business divestitures (in dollars per share)			$ 0.50
Net proceeds from sale of EIG			798
Tax payment related to sale of EIG			$ 260