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Assets Held for Sale (Assets Held for Sale) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Assets and liabilites held for sale [Line Items]        
Cash and cash equivalents $ 83 $ 87 $ 161 $ 138
Inventories 1,226 1,267    
Deferred tax assets 132 150    
Property, plant and equipment 4,521 4,309    
Intangible assets 722 $ 824    
Assets and liabilities held for sale [Member]        
Assets and liabilites held for sale [Line Items]        
Cash and cash equivalents 5      
Trade and other receivables 41      
Inventories 35      
Property, plant and equipment 25      
Intangible assets 63      
Assets held for sale $ 169