Equity Method Investements (Details) lb in Millions, $ in Millions		12 Months Ended
	Jun. 17, 2015 lb	Dec. 31, 2019 USD ($) lb	Nov. 12, 2019 USD ($)	Oct. 28, 2019	Dec. 31, 2018 USD ($)
Schedule of Equity Method Investments [Line Items]
Investments in joint ventures		$ 225
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity		166
Equity Method Investments		1,112			$ 253
LACC, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Ownership interest (in percent)			34.80%	12.00%
Increase in Equity Method Investment		$ 817	$ 817
Investments in and Advances to Affiliates, Proportionate Share Of Production, Mass | lb		215
Investments in and Advances to Affiliates, at Fair Value		$ 1,038			183
Investments in and Advances to Affiliates, at Fair Value, Gross Additions		45
Investments in and Advances to Affiliates, at Fair Value, Gross Reductions		(7)
other equity method investments [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investments		$ 74			70
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]
Related Party Transaction, Reimbursement Agreement, Term		6 years 6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period		25 years
Revenue, Remaining Performance Obligation, Amount		$ 81
Contract with Customer, Liability		$ 7			0
LACC, LLC [Member]
Schedule of Equity Method Investments [Line Items]
Related Party Transaction, Reimbursement Agreement, Term		6 years 6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period		25 years
Revenue, Remaining Performance Obligation, Amount		$ 59
Contract with Customer, Liability		$ 5			$ 0