Related Party Transactions (Details) - USD ($) $ in Millions		6 Months Ended			12 Months Ended
		Dec. 31, 2019	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2020	Dec. 31, 2018
Related Party Transaction [Line Items]
Revenues from distribution agreement			$ 1			$ 1
Shared Services Costs Incurred by Hexion				$ 15		28
Shared Services Costs Incurred by MPM			14			21
Shared Services Net Billings - Hexion to MPM			11			14
Note receivable from parent					$ 10
Settlement of affiliate loan					10
Return of Capital To Parent					3
Apollo [Member]
Related Party Transaction [Line Items]
Annual management consulting fee			$ 3
Annual management consulting fee percentage			2.00%
Momentive Performance Materials Inc. [Member]
Related Party Transaction [Line Items]
Related Party Transaction, Other Revenues from Transactions with Related Party						1
Related Party Transaction, Purchases from Related Party			$ 10			32
Apollo Affiliates and Other Related Parties [Member]
Related Party Transaction [Line Items]
Net Sales to Related Parties			1			2
Other joint ventures unconsolidated [Member]
Related Party Transaction [Line Items]
Net Sales to Related Parties	[1],[2]	$ 2	2		2	9
Related Party Transaction, Purchases from Related Party	[2]	2	2		1	6
Accounts Receivable, Related Parties	[3]	1			1
Accounts Payable, Related Parties		1			0
Loans and Leases Receivable, Related Parties		7			4
Other joint ventures unconsolidated [Member] | Discontinued Operations
Related Party Transaction [Line Items]
Net Sales to Related Parties		1	$ 1		1	$ 7
Accounts Receivable, Related Parties		$ 1			$ 1

[1] Sales to joint ventures includes sales to the Russia JV of $1, $1, $1, and $7 for the year ended December 31, 2020, the Successor period July 2, 2019 through December 31, 2019, the Predecessor period January 1, 2019 through July 1, 2019 and the year ended December 31, 2018, which are included in the Held for Sale Business.

[2] There were no sales to joint ventures or purchases from joint ventures for the Predecessor period July 1, 2019.

[3] Accounts receivable from joint ventures is mostly comprised of receivables from the Russia JV included in the Held for Sale Business. Accounts receivable from the Company’s other joint ventures was less than $1 for both December 31, 2020 and 2019.