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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2010 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Maturity period of investments description |  | Three months or less |  |
Minimum Derivative Financial Instrument's Term (Months) |  | 2 months |  |
Maximum Derivative Financial Instrument's Term (Months) |  | 24 months |  |
Derivative Assets |  | $ 105 | $ 26 |
Derivative Liabilities |  | 19 | 96 |
Fair Value of Foreign Currency Forward Contracts |  | 86 |  |
Allowances for excess and obsolete inventories |  | 338 | 281 |
Depreciation expense related to property, plant and equipment |  | 323 | 279 | 262
Impairment of long-lived assets |  | 0 | 0 | 0
Goodwill |  | 7,172 | 6,151 | 5,790
Indefinite-lived intangible assets |  | 4,743 | 4,073 |
Estimated useful lives of intangible assets, Minimum |  | 2 years |  |
Estimated useful lives of intangible assets, Maximum |  | 30 years |  |
Amortization expense |  | 300 |  |
Number of years as first period of amortization |  | 5 years |  |
Net foreign currency transaction gains (losses) |  | 21 | 10 | 30
Devalued asset charges | 27 | 12 |  |
Written down charges of accounts receivable |  | 11 |  |
Net investment in Venezuela |  | 34 |  |
Net allowances for doubtful accounts |  | 120 | 107 |
Compensation cost charged against income for share-based compensation arrangements |  | 80 | 73 | 66
Income tax benefit recognized for share-based compensation arrangements |  | 24 | 17 | 20
Anti-dilutive stock options outstanding |  | 5 | 3 | 8
Fair Value, Inputs, Level 2 [Member] |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Derivative Assets |  | 105 |  |
Derivative Liabilities |  | 19 |  |
Trade Names [Member] |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |
Indefinite-lived intangible assets |  | $ 643 |  |

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