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Acquisitions and Divestitures Acquisitions (Dow Corning) (Details) - USD ($)
$ in Millions
9 Months Ended
Jun. 01, 2016
Sep. 30, 2017
Sep. 30, 2016
May 31, 2016
Business Acquisition [Line Items]        
Net gain on step acquisition of nonconsolidated affiliate   $ 0 $ 2,445  
Dow Corning Corporation [Member]        
Business Acquisition [Line Items]        
Business Acquisition, Percentage of Voting Interests Acquired 50.00%      
Net gain on step acquisition of nonconsolidated affiliate $ 2,445      
Deferred Other Tax Expense (Benefit) $ (141)      
Dow Corning Corporation [Member]        
Business Acquisition [Line Items]        
Equity Method Investment, Ownership Percentage       50.00%
Corning Incorporated [Member] | SplitCo [Member]        
Business Acquisition [Line Items]        
Noncontrolling Interest, Ownership Percentage by Parent 100.00%