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Short-Term and Long-Term Borrowings Short-Term and Long-Term Borrowings (Long-Term Borrowings) (Narrative) (Details)
$ in Millions
1 Months Ended 12 Months Ended 36 Months Ended 48 Months Ended
May 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Mar. 22, 2019
Dec. 31, 2018
Mar. 22, 2016
USD ($)
yr
borrowings
Jun. 30, 2015
USD ($)
May 12, 2015
USD ($)
Debt Instrument [Line Items]                  
Dividend received from Chemours $ 3,923                
Cash distribution received from Chemours $ 3,416                
Separation related transaction costs   $ 35 $ 306 $ 175          
Long-term Debt, Maturities, Repayments of Principal in Year Two   1,323              
Long-term Debt, Maturities, Repayments of Principal in Year Three   1,004              
Long-term Debt, Maturities, Repayments of Principal in Year Four   1,003              
Long-term Debt, Maturities, Repayments of Principal in Year Five   1,503              
Long-term Debt, Maturities, Repayments of Principal after Year Five   3,300              
Line of Credit Facility, Remaining Borrowing Capacity   7,900 4,900            
Senior Note 1 Point 95 Percent Due 2016 [Member]                  
Debt Instrument [Line Items]                  
Senior Notes   $ 0 [1] $ 348 [1]         $ 152  
Debt Instrument, Interest Rate, Stated Percentage   1.95% 1.95%         1.95%  
Senior notes due 2016 [Member]                  
Debt Instrument [Line Items]                  
Senior Notes               $ 488  
Senior Note 2 Point 75 Percent Due 2016 [Member]                  
Debt Instrument [Line Items]                  
Senior Notes   $ 0 [1] $ 223 [1]         $ 277  
Debt Instrument, Interest Rate, Stated Percentage   2.75% 2.75%         2.75%  
Senior Note 5 Point 25 Percent Due 2016 [Member]                  
Debt Instrument [Line Items]                  
Senior Notes   $ 0 [1] $ 541 [1]         $ 59  
Debt Instrument, Interest Rate, Stated Percentage   5.25% 5.25%         5.25%  
Term Loan Facility due 2019 [Member]                  
Debt Instrument [Line Items]                  
Line of Credit Facility, Maximum Borrowing Capacity             $ 4,500    
Number of borrowings permitted | borrowings             7    
Period from closing date for allowed borrowings | yr             1    
Long-term line of credit, noncurrent   $ 500 $ 0            
Line of Credit Facility, Remaining Borrowing Capacity   $ 4,000              
Term Loan Facility due 2019 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Basis Spread on Variable Rate   0.75%              
Term Loan Facility due 2019 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Basis Spread on Variable Rate   1.25%              
Term Loan Facility due 2019 [Member] | Federal Funds Effective Rate [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Basis Spread on Variable Rate   0.50%              
Term Loan Facility due 2019 [Member] | Margin [Member] | Minimum [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Basis Spread on Variable Rate   0.00%              
Term Loan Facility due 2019 [Member] | Margin [Member] | Maximum [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Basis Spread on Variable Rate   0.25%              
Chemours Notes Received [Member] | SeniorNotes7PercenteDue2025 [Member]                  
Debt Instrument [Line Items]                  
Senior Notes                 $ 507
Debt Instrument, Interest Rate, Stated Percentage                 7.00%
Loss on extinguishment of debt [Member]                  
Debt Instrument [Line Items]                  
Separation related transaction costs     20            
Fair Value, Inputs, Level 2 [Member]                  
Debt Instrument [Line Items]                  
Long-term Debt, Fair Value   $ 8,460 $ 7,860            
Scenario, Forecast [Member]                  
Debt Instrument [Line Items]                  
Line of Credit Facility, Expiration Period           2 years      
Scenario, Forecast [Member] | Term Loan Facility due 2019 [Member]                  
Debt Instrument [Line Items]                  
Line of Credit Facility, Expiration Period         3 years        
[1] Includes long-term debt due within one year.