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Equity Method Investements (Details)
lb in Millions, $ in Millions
 12 Months Ended
Jun. 17, 2015
lb
Dec. 31, 2020
USD ($)
lb
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Nov. 12, 2019
USD ($)
Oct. 28, 2019
Schedule of Equity Method Investments [Line Items]            
Investments in joint ventures     $ 225      
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity   $ 166        
Return of investment   (44) 0 $ 0    
Equity Method Investments   1,059 1,112      
LACC, LLC [Member]            
Schedule of Equity Method Investments [Line Items]            
Ownership interest (in percent)         34.80% 12.00%
Increase in Equity Method Investment   $ 0 817   $ 817  
Investments in and Advances to Affiliates, Proportionate Share Of Production, Mass | lb   787        
Investments in and Advances to Affiliates, at Fair Value   $ 961 1,038 $ 183    
Cash contributions   4 45      
Depreciation and amortization   (37) (7)      
Return of investment   (44) 0      
other equity method investments [Member]            
Schedule of Equity Method Investments [Line Items]            
Equity Method Investments   98 74      
Affiliates [Member]            
Schedule of Equity Method Investments [Line Items]            
Plant capacity (in lbs) | lb 2,200          
Lotte Chemical Corporation [Member]            
Schedule of Equity Method Investments [Line Items]            
Revenue, Remaining Performance Obligation, Amount   78        
Contract with Customer, Liability   $ 12 7      
LACC, LLC [Member]            
Schedule of Equity Method Investments [Line Items]            
Related Party Transaction, Reimbursement Agreement, Term   6 years 6 months        
Revenue, Remaining Performance Obligation, Amount   $ 57        
Contract with Customer, Liability   $ 10 $ 5      
LACC, LLC [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01            
Schedule of Equity Method Investments [Line Items]            
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period   25 years