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Details of Income Statement Items (Sales) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Notes to Consolidated Financial Statements [Abstract]      
Sales $ 5,556 $ 5,418 $ 5,363
Cost of sales [Abstract]      
Materials 1,643 1,504 1,546
Cost of labor 791 777 753
Depreciation and amortization 384 363 317
Energy 349 343 315
Other 535 759 772
Cost of sales $ 3,702 $ 3,746 $ 3,703