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Acquisitions and Dispositions (Acquistions) (Detail)
$ in Millions
1 Months Ended 12 Months Ended
Jan. 31, 2017
distribution_center
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jan. 31, 2018
store
Jun. 30, 2016
Dec. 31, 2013
Business Acquisition [Line Items]              
Consideration paid for acquired entities, net of cash acquired, debt assumed, and other adjustments   $ 9 $ 108 $ 74      
Number Of Distributors (more than) | distribution_center 200            
Taiwan Chlorine Industries (“TCI”)              
Business Acquisition [Line Items]              
Business combination, recognized identifiable assets acquired and liabilities assumed, net       $ 100      
ProCoatings [Member]              
Business Acquisition [Line Items]              
Number of stores | store         27    
Taiwan Chlorine Industries (“TCI”)              
Business Acquisition [Line Items]              
Noncontrolling interest, ownership percentage by parent       40.00%   40.00% 60.00%
Taiwan Chlorine Industries (“TCI”) | China Petrochemical Development Corporation [Member]              
Business Acquisition [Line Items]              
Noncontrolling interest, ownership percentage by parent           40.00%  
China Petrochemical Development Corporation [Member] | Axiall Corporation              
Business Acquisition [Line Items]              
Noncontrolling interest, ownership percentage by parent           40.00%