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Business Divestiture (Effect Of Businesses Divestitures) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Effect Of Businesses Divestitures [Line Items]      
Net assets and liabilities $ 153    
Net cash inflow 902 [1] $ 6 $ 17
Consideration received in cash [Member]      
Effect Of Businesses Divestitures [Line Items]      
Net cash inflow [2] 938    
Income tax paid [Member]      
Effect Of Businesses Divestitures [Line Items]      
Net cash inflow (35)    
Cash disposed of [Member]      
Effect Of Businesses Divestitures [Line Items]      
Net cash inflow (1)    
Cash and cash equivalents [Member]      
Effect Of Businesses Divestitures [Line Items]      
Net assets and liabilities 1    
Trade and other receivables [Member]      
Effect Of Businesses Divestitures [Line Items]      
Net assets and liabilities 34    
Inventories [Member]      
Effect Of Businesses Divestitures [Line Items]      
Net assets and liabilities 59    
Property, Plant and Equipment      
Effect Of Businesses Divestitures [Line Items]      
Net assets and liabilities 26    
Intangible Assets [Member]      
Effect Of Businesses Divestitures [Line Items]      
Net assets and liabilities 64    
Trade payables and other current liabilities [Member]      
Effect Of Businesses Divestitures [Line Items]      
Net assets and liabilities (28)    
Deferred tax liabilities [Member]      
Effect Of Businesses Divestitures [Line Items]      
Net assets and liabilities $ (3)    
[1] See Note 10.
[2] The consideration received in cash is net of $16 million transaction expenses.