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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
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Entity Wide Portfolio Carrying Amount Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues | $ 764 | $ 822 | $ 777 | $ 764 | $ 669 | $ 697 | $ 651 | $ 631 | $ 3,127 | $ 2,648 | $ 2,107
Drilling and Production [Member] |  |  |  |  |  |  |  |  |  |  |
Entity Wide Portfolio Carrying Amount Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 691 | 625 | 496
Pipe [Member] |  |  |  |  |  |  |  |  |  |  |
Entity Wide Portfolio Carrying Amount Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 587 | 418 | 287
Valves [Member] |  |  |  |  |  |  |  |  |  |  |
Entity Wide Portfolio Carrying Amount Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 664 | 541 | 374
Fittings and Flanges [Member] |  |  |  |  |  |  |  |  |  |  |
Entity Wide Portfolio Carrying Amount Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 523 | 419 | 350
Mill Tool, MRO, Safety and Other [Member] |  |  |  |  |  |  |  |  |  |  |
Entity Wide Portfolio Carrying Amount Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | $ 662 | $ 645 | $ 600

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