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, 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