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Acquisitions and Divestitures - Summary of Final Allocation of Purchase Price by Major Asset Acquired and Liability Assumed, Amount of Goodwill Recognized (Detail) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Assets: |  |
Goodwill | $ 5,384 | $ 5,401
RTI [Member] |  |
Assets: |  |
Cash | 303 |
Receivables from customers | 94 |
Inventories | 483 |
Prepaid expenses and other current assets | 47 |
Properties, plants, and equipment | 321 |
Goodwill | 298 |
Other noncurrent assets | 60 |
Total assets | 1,606 |
Liabilities: |  |
Accounts payable | 86 |
Other current liabilities | 94 |
Long-term debt due within one year | 115 |
Long-term debt, less amount due within one year | 387 |
Other noncurrent liabilities | 111 |
Total liabilities | 793 |
Equity |  |
Additional capital | 60 |
Total equity | $ 60 |

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