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Acquisitions and Divestitures - Summary of Preliminary Allocation of Purchase Price by Major Asset Acquired and Liability Assumed and Amount of Goodwill Recognized (Detail) - USD ($) $ in Millions | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Assets: |  |
Goodwill | $ 5,443 | $ 5,247
RTI [Member] |  |
Assets: |  |
Cash and cash equivalents | 302 |
Receivables from customers | 103 |
Inventories | 538 |
Other current assets | 68 |
Properties, plants, and equipment, net | 436 |
Goodwill | 209 |
Other noncurrent assets | 91 |
Total assets | 1,747 |
Liabilities: |  |
Accounts payable | 90 |
Long-term debt due within one year | 115 |
Other current liabilities | 93 |
Long-term debt | 440 |
Other noncurrent liabilities | 139 |
Total liabilities | $ 877 |

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