| **Restructuring Charges and Other Costs Associated with Acquisitions and Cost-Reduction/Productivity Initiatives - Restructuring Accruals (Detail) (USD $)In Millions, unless otherwise specified**                                                                       | 3 Months Ended | 99 Months Ended |          | 3 Months Ended |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|-----------------|----------|----------------|
||
| **Restructuring Reserve [Roll Forward]**                                                                                                                                                                                                                                  |           |                 |     |                |   |   |   |  |   |  |   |  |
| Balance, December 31, 2012                                                                                                                                                                                                                                                | $ 1,950        | [1]             |     |                | $ 1,200 | $ 731 | $ 1,793 | [1] | $ 0 | [1] | $ 157 | [1] |
| Provision                                                                                                                                                                                                                                                                 | 99             |                 |     |                |   |   | (20) |  | 105 |  | 14 |  |
| Utilization and other                                                                                                                                                                                                                                                     | (478)          | [2]             |     |                |   |   | (340) | [2] | (105) | [2] | (33) | [2] |
| Balance, March 31, 2013                                                                                                                                                                                                                                                   | 1,571          | [3]             | 1,571    | [3]            | 1,200 | 731 | 1,433 | [3] | 0 | [3] | 138 | [3] |
| Restructuring charges                                                                                                                                                                                                                                                     |           |                 | $ 15,700 |                |   |   |   |  |   |  |   |  |
|                                                                                                                                                                                                                                                                           |
| [1]Included in Other current liabilities ($1.2 billion) and Other noncurrent liabilities ($731 million).[2]Includes adjustments for foreign currency translation.[3]Included in Other current liabilities ($919 million) and Other noncurrent liabilities ($652 million). |

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| - Definition
Adjustment to restructuring reserve resulting from utilization and foreign currency translation.
+ References
No definition available.
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| - Definition
Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.
+ References
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| - Definition
Net total Increase or Decrease in the accrual for restructuring costs during the reporting period.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 146 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 95-3 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.  This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=6394695&loc=d3e140904-122747Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4
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