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Acquisitions and Investments - Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Feb. 20, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 56 | $ 167 | $ 1,903
Total assets acquired |  | 116 | 406 | 3,329
Total liabilities |  | 30 | 115 | $ 932
All Other Acquisitions [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Current assets, net of cash acquired | $ 428 |  |  |
Property, plant and equipment | 250 |  |  |
Intangible assets | 894 | $ 12 | $ 59 |
Goodwill | 1,590 |  |  |
Other assets | 49 |  |  |
Total assets acquired | 3,211 |  |  |
Current liabilities | 186 |  |  |
Deferred taxes | 524 |  |  |
Other liabilities | 123 |  |  |
Total liabilities | 833 |  |  |
Cash consideration, net of cash acquired | $ 2,378 |  |  |

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