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Acquisitions and Divestitures Divestitures (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Income tax expense $ 86 $ 104 $ 188 $ 191
Income from discontinued operations, net of tax $ 2 $ 0 $ 2 6
Glass Segment [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Income from operations       8
Income tax expense       2
Income from discontinued operations, net of tax       $ 6