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HSG Transactions (Narrative) (Details)
3 Months Ended 9 Months Ended
Sep. 09, 2020
USD ($)
item
Sep. 30, 2020
USD ($)
item
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
item
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2016
May 31, 2016
Pre-existing contract disputes, loss on settlement   $ 83,000,000 $ (24,000,000) $ 108,000,000 $ (24,000,000)        
Cash and cash equivalents   2,514,000,000 $ 971,000,000 2,514,000,000 $ 971,000,000 $ 2,434,000,000 $ 2,355,000,000    
Customer deposits/ deferred revenue   1,300,000,000   1,300,000,000   1,000,000,000.0      
Deferred revenue $ 1,070,000,000                
Noncontrolling interests   197,000,000   197,000,000   $ 90,000,000      
HSG [Member]                  
Pre-tax gain       $ 498,000,000          
Customer deposits/ deferred revenue 264,000,000                
HSG [Member] | Developed Technologies [Member]                  
Intangible asset estimated useful lives       20 years          
Intangible assets   215,000,000   $ 215,000,000          
HSG [Member] | Other Intangible Assets [Member]                  
Intangible asset estimated useful lives       15 years          
Intangible assets   $ 70,000,000   $ 70,000,000          
HSG [Member] | Measurement Input, Discount Rate [Member]                  
Measurement input | item   0.165   0.165          
HSG [Member] | Measurement Input, Long-term Revenue Growth Rate [Member]                  
Measurement input | item   0   0          
HSG [Member]                  
Pre-existing contract disputes, loss on settlement       $ (165,000,000)          
Cash and cash equivalents 75,000,000                
Customer deposits/ deferred revenue   $ 264,000,000   264,000,000          
Deferred revenue   1,070,000,000   1,070,000,000          
Noncontrolling interests   102,000,000   $ 102,000,000          
HSG [Member] | HSG Debt [Member]                  
Debt Instrument, Face Amount 175,000,000                
Dow Corning Corporation [Member]                  
Ownership interest               50.00% 50.00%
Dupont’s Trichlorosilane [Member]                  
Settlement term       3 years          
Annual payment amount 58,000,000                
Dupont’s Trichlorosilane [Member] | HSG [Member]                  
Purchase consideration 255,000,000                
Pre-existing contract disputes 175,000,000                
Pre-existing contract disputes, fair value 200,000,000                
HSG [Member]                  
Purchase consideration 250,000,000                
Pre-tax gain 498,000,000                
Acquisition-related costs   11,000,000   $ 11,000,000          
HSG [Member] | Developed Technologies [Member]                  
Intangible asset estimated useful lives       20 years          
Intangible assets   215,000,000   $ 215,000,000          
HSG [Member] | Other Intangible Assets [Member]                  
Intangible asset estimated useful lives       15 years          
Intangible assets   $ 70,000,000   $ 70,000,000          
HSG [Member] | HSG [Member]                  
Redemption price 250,000,000                
HSG [Member] | HSG [Member]                  
Purchase consideration $ 250,000,000                
Hemlock Semiconductor LLC [Member]                  
Business combination ownership interest acquired 100.00%                
Previously Held Interest In HSG [Member]                  
Purchase consideration $ 0                
Minimum [Member]                  
Ownership interest   20.00%   20.00%          
Minimum [Member] | HSG [Member] | Measurement Input, Discount Rate [Member]                  
Measurement input | item 0.0254                
Minimum [Member] | HSG [Member]                  
Year   2029   2029          
Minimum [Member] | HSG [Member] | Measurement Input, Discount Rate [Member]                  
Measurement input | item   0.0254   0.0254          
Maximum [Member]                  
Ownership interest   50.00%   50.00%          
Maximum [Member] | HSG [Member] | Measurement Input, Discount Rate [Member]                  
Measurement input | item 0.0323                
Maximum [Member] | HSG [Member]                  
Year   2034   2034          
Maximum [Member] | HSG [Member] | Measurement Input, Discount Rate [Member]                  
Measurement input | item   0.0323   0.0323          
TCS Settlement [Member]                  
Pre-existing contract disputes, loss on settlement   $ 81,000,000   $ 81,000,000          
TCS Settlement [Member] | HSG [Member]                  
Pre-existing contract disputes, loss on settlement   $ 200,000,000