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Significant Transactions and Events - Narrative (Details)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Aug. 31, 2016
USD ($)
Jul. 31, 2016
USD ($)
May 31, 2016
USD ($)
Mar. 31, 2016
USD ($)
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Jun. 30, 2016
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Apr. 30, 2016
USD ($)
Significant Transactions And Events [Line Items]                      
Asset related and other charges               $ 4 $ 1 $ 119  
Recognized gain on sale of land   $ 42           45 22 254  
Net cash proceeds of transaction   39           46 39 708  
Environmental remediation activities amount   $ 3           36 $ 48 44  
ICOR International, Inc. [Member]                      
Significant Transactions And Events [Line Items]                      
Total consideration in all cash acquisition $ 37                    
ICOR International, Inc. [Member] | Maximum [Member]                      
Significant Transactions And Events [Line Items]                      
Acquisition related expense               $ 1      
Linden, New Jersey [Member]                      
Significant Transactions And Events [Line Items]                      
Number of acre of land for sale | a           210          
Other Income, Net [Member]                      
Significant Transactions And Events [Line Items]                      
Gain on sale of assets                   89  
Sulfur Business [Member] | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations [Member]                      
Significant Transactions And Events [Line Items]                      
Purchase price             $ 325        
Proceeds from sale       $ 311              
Sulfur Business [Member] | Assets Held-for-sale [Member]                      
Significant Transactions And Events [Line Items]                      
Cash proceeds from sale of facility         $ 10            
Loss on sale       $ 4              
Sulfur Business [Member] | Disposed by Sale [Member]                      
Significant Transactions And Events [Line Items]                      
Asset related and other charges             $ 58     58  
Clean and Disinfect Product Line [Member]                      
Significant Transactions And Events [Line Items]                      
Gain on sale of assets                   169  
Clean and Disinfect Product Line [Member] | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations [Member]                      
Significant Transactions And Events [Line Items]                      
Purchase price                     $ 230
Proceeds from sale     $ 223                
Cash transferred in sale     $ 2                
Transaction and other charges                   $ 9  
Aniline Facility, Beaumont, Texas [Member] | Disposed by Sale [Member]                      
Significant Transactions And Events [Line Items]                      
Cash proceeds from sale of facility           $ 140          
Transaction costs           $ 11