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Acquisitions and Divestitures Divestitures (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Income tax expense $ 109 $ 112
Income from discontinued operations, net of tax $ 0 10
Flat Glass Business [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Net sales   128
Income from operations   15
Income tax expense   5
Income from discontinued operations, net of tax   $ 10