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Derivative and Other Financial Instruments (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]    
Objectives for using derivative instruments The Company’s objective in managing exposure to market risk is to limit the impact on earnings and cash flow.  
Net gain to be reclassified to earnings $ 24,000,000  
Gain, net of tax, expected to be reclassified to earnings 20,000,000  
Reclassification of anticipated transactions that were no longer considered probable 0 $ 0
Gain (loss) on net investment hedge (153,000,000) 35,000,000
Gain (loss) on net investment hedge, net of tax (134,000,000) 23,000,000
Foreign exchange    
Derivative Instruments, Gain (Loss) [Line Items]    
Loss on foreign exchange contracts designated as fair value hedges 1,000,000 8,000,000
Gain on foreign exchange contracts not designated as fair value hedges 41,000,000 11,000,000
Commodities    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) on commodity hedge ineffectiveness 2,000,000 (7,000,000)
Gain (loss) on commodity hedge ineffectiveness, net of tax $ 1,000,000 $ (5,000,000)
Minimum    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative, higher remaining maturity range 1 month  
Maximum    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative, higher remaining maturity range 34 months