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Details of Income Statement Items (Sales) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Notes to Consolidated Financial Statements [Abstract]      
Sales $ 5,271 $ 5,556 $ 5,418
Cost of sales [Abstract]      
Materials consumed 1,702 1,643 1,504
Cost of labor 766 791 777
Depreciation and amortization 384 384 363
Energy and fuel 340 349 343
Other 262 535 759
Cost of sales $ 3,454 $ 3,702 $ 3,746