Segment Information (Schedule of Net Sales by Product Line) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales	$ 794	$ 970
Line pipe [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales	100	154
Carbon Fittings And Flanges [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales	115	153
Carbon Pipe, Fittings And Flanges [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales	215	307
Valves, Automation, Measurement And Instrumentation [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales	323	383
Gas Products [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales	134	133
Stainless Steel Alloy Pipe and Fittings [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales	37	50
General Oilfield Products [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Sales	$ 85	$ 97