Acquisitions and Divestitures - Summary of Preliminary Allocation of Purchase Price by Major Asset Acquired and Liability Assumed, Amount of Goodwill Recognized (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assets:
Goodwill	$ 5,401	$ 5,247	$ 3,415
Total assets	2,003	3,515
Liabilities:
Total liabilities	868	$ 345
RTI [Member]
Assets:
Cash and cash equivalents	302
Receivables from customers	103
Inventories	531
Prepaid expenses and other current assets	47
Properties, plants, and equipment	436
Goodwill	240
Other noncurrent assets	93
Total assets	1,752
Liabilities:
Accounts payable	90
Other current liabilities	94
Long-term debt due within one year	115
Long-term debt, less amount due within one year	385
Other noncurrent liabilities	138
Total liabilities	822
Equity:
Additional capital	60
Total equity	$ 60