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Details of Income Statement Items (Tables)
12 Months Ended
Dec. 31, 2017
Notes to Consolidated Financial Statements [Abstract]  
Cost of sales

 

For the year ended December 31

 

2017

2016

2015

 

$ millions

$ millions

$ millions

 

Sales

5,418

5,363

5,405

 

 

 

 

Cost of sales

 

 

 

Materials

1,504

1,546

1,576

Cost of labor

777

753

694

Energy

343

315

305

Other

1,122

1,089

1,027

 

3,746

3,703

3,602

 

Expenses
Other income and expenses
Financing income and expenses