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Commitments, Contingencies and Guarantees (Narrative) (Details)
$ in Millions
1 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2018
USD ($)
item
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
May 31, 2016
USD ($)
Loss Contingency, Accrual, Current     $ 113 $ 41    
Loss Contingency, Accrual, Noncurrent     279 338    
Operating Leases, Rent Expense     156 135 $ 105  
Dow Corning Breast Implant Litigation [Member]            
Payment of claims     1,800      
Loss Contingency, Accrual     263     $ 290
Dow Corning Bankruptcy Pendency Interest Claims [Member]            
Loss Contingency, Accrual     $ 82     $ 107
Indemnification of excess liability     50.00%      
Pittsburgh Corning Corporation PCC [Member]            
Equity Method Investment, Ownership Percentage     50.00%      
Dow Corning Corporation [Member]            
Equity Method Investment, Ownership Percentage           50.00%
Investment in affiliated companies, at equity           $ 4,800
Environmental Cleanup and Related Litigation [Member]            
Number of Hazardous Waste Sites | item     15      
Accrual for Environmental Loss Contingencies     $ 30 38    
Amended Pittsburgh Corning Corporation Plan [Member] | Asbestos Litigation [Member]            
Payment of claims $ 35 $ 70        
Loss Contingency, Accrual     185   $ 290  
Loss Contingency, Accrual, Current     50      
Loss Contingency, Accrual, Noncurrent     135      
Non-PCC Asbestos Litigation [Member] | Asbestos Litigation [Member]            
Loss Contingency, Accrual, Noncurrent     $ 146 $ 147    
Minimum [Member]            
Equity Method Investment, Ownership Percentage     20.00%      
Maximum [Member]            
Equity Method Investment, Ownership Percentage     50.00%