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Business Segments - Schedule of Comparison of Approximate Sales Mix in Principal Product Categories (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Entity Wide Portfolio Carrying Amount Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues | $ 644 | $ 753 | $ 750 | $ 863 | $ 1,006 | $ 1,070 | $ 952 | $ 1,077 | $ 3,010 | $ 4,105 | $ 4,296
Drilling and Production [Member] |  |  |  |  |  |  |  |  |  |  |
Entity Wide Portfolio Carrying Amount Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 632 | 991 | 987
Pipe [Member] |  |  |  |  |  |  |  |  |  |  |
Entity Wide Portfolio Carrying Amount Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 509 | 723 | 845
Valves [Member] |  |  |  |  |  |  |  |  |  |  |
Entity Wide Portfolio Carrying Amount Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 538 | 801 | 839
Fittings and Flanges [Member] |  |  |  |  |  |  |  |  |  |  |
Entity Wide Portfolio Carrying Amount Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 448 | 667 | 664
Mill Tool, MRO, Safety and Other [Member] |  |  |  |  |  |  |  |  |  |  |
Entity Wide Portfolio Carrying Amount Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | $ 883 | $ 923 | $ 961

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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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