Acquisitions and Divestitures - Assets and Liabilities of Discontinued Operations (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accounts receivable, less allowance for doubtful accounts	$ 523	$ 550
Current deferred tax assets and other current assets	433	419
Property, plant and equipment, less accumulated depreciation	1,046	1,118
Goodwill	492	498
Identifiable intangible assets, less accumulated amortization	2,652	2,648
Noncurrent deferred tax assets and other noncurrent assets	125	84
Assets of discontinued operations and other assets held for sale	5,271	5,317
Current liabilities	554	385
Other liabilities	856	839
Liabilities of discontinued operations	$ 1,410	$ 1,224