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Acquisitions - Estimated Fair Values of Assets Acquired and Liabilities (Detail) (USD $) In Millions, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Business Acquisition [Line Items] |  |
Goodwill | $ 8,997 | $ 7,172
All Other Acquisitions [Member] |  |
Business Acquisition [Line Items] |  |
Current assets, net of cash acquired | 446 |
Property, plant and equipment | 198 |
Intangible assets | 969 |
Goodwill | 1,538 |
Other assets | 25 |
Total assets acquired | 3,176 |
Current liabilities | 190 |
Deferred taxes | 491 |
Other liabilities | 120 |
Total liabilities | 801 |
Cash consideration, net of cash acquired | $ 2,375 |

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