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Commitments, Contingencies and Guarantees (Details)
$ in Millions
1 Months Ended 6 Months Ended 9 Months Ended
May 31, 2016
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
Sep. 30, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
Dec. 31, 2016
USD ($)
Loss Contingency, Accrual, Current         $ 63 $ 57  
Loss Contingency, Accrual, Noncurrent         144 196  
Investment in affiliated companies, at equity         285 291  
Asbestos Litigation [Member]              
Loss Contingency, Accrual         97 98  
Dow Corning Breast Implant Litigation [Member]              
Payment         1,800    
Loss Contingency, Accrual $ 290       160    
Indemnification of excess liability       50.00%      
Dow Corning Bankruptcy Pendency Interest Claims [Member]              
Loss Contingency, Accrual $ 107            
Dow Corning Environmental Claims [Member]              
Indemnification of excess liability       50.00%      
Amended Pittsburgh Corning Corporation Plan [Member] | Asbestos Litigation [Member]              
Loss Contingency, Accrual         100    
Loss Contingency, Accrual, Current         50    
Loss Contingency, Accrual, Noncurrent         $ 50    
Pittsburgh Corning Corporation PCC [Member] | Asbestos Litigation [Member]              
Equity Method Investment, Ownership Percentage             50.00%
Payment   $ 35 $ 50        
Loss Contingency, Accrual             $ 290
Dow Corning Corporation [Member]              
Equity Method Investment, Ownership Percentage 50.00%           50.00%
Indemnification of excess liability 50.00%            
Environmental Cleanup and Related Litigation [Member]              
Number of Hazardous Waste Sites | item         15    
Accrual for Environmental Loss Contingencies         $ 78 $ 41  
Minimum [Member]              
Equity Method Investment, Ownership Percentage         20.00%    
Maximum [Member]              
Equity Method Investment, Ownership Percentage         50.00%