Schedule of Fresh Start Adjustments to the Balance Sheet (Details) - USD ($) $ in Millions	Jul. 02, 2019	Jul. 01, 2019
Fresh-Start Adjustment [Line Items]
Elimination of Predecessor other intangible assets		$ (24)
Elimination of Predecessor Company accumulated other comprehensive income		(26)
Inventory fair value adjustments		29
Property, plant and equipment fair value adjustment		780
Pension liability fair value adjustment		(44)
Net impact on accumulated deficit		1,840
Plus: Total cash		125
Establishment of Successor goodwill		178
Establishment of Successor other intangible assets	$ 1,219	1,219
Repayment of DIP Term Loan interest		(5)
Total equity (deficit)		1,156
Total liabilities and equity (deficit)		4,292
Continuing Operations
Fresh-Start Adjustment [Line Items]
Elimination of Predecessor other intangible assets		(17)
Elimination of Predecessor Company accumulated other comprehensive income		51
Inventory fair value adjustments		27
Property, plant and equipment fair value adjustment		622
Pension liability fair value adjustment		(39)
Net impact on accumulated deficit		1,721
Plus: Total cash		125
Establishment of Successor goodwill		164
Establishment of Successor other intangible assets		1,155
Paid-in capital (Successor)		1,157
Noncontrolling interest		(1)
Total equity (deficit)		1,156
Discontinued Operations
Fresh-Start Adjustment [Line Items]
Elimination of Predecessor other intangible assets		(7)
Elimination of Predecessor Company accumulated other comprehensive income		(77)
Inventory fair value adjustments		2
Property, plant and equipment fair value adjustment		158
Pension liability fair value adjustment		(5)
Net impact on accumulated deficit		119
Establishment of Successor goodwill		14
Establishment of Successor other intangible assets		64
Successor Company [Member]
Fresh-Start Adjustment [Line Items]
Establishment of Successor goodwill		178
Successor Company [Member] | Continuing Operations
Fresh-Start Adjustment [Line Items]
Plus: Total cash		125
Accounts receivable (net of allowance for doubtful accounts of $16 and $0, respectively)		427
Finished and in-process goods		248
Raw materials and supplies		89
Current assets held for sale		134
Other current assets		58
Total current assets		1,081
Investment in unconsolidated entities		14
Deferred tax assets		9
Other long-term assets		37
Land		80
Buildings		110
Machinery and equipment		1,111
Property, Plant, and Equipment, Gross		1,301
Less accumulated depreciation		7
Property, Plant, and Equipment, Net		1,308
Operating lease assets		122
Establishment of Successor goodwill		164
Establishment of Successor other intangible assets		1,155
Noncurrent assets held for sale		402
Total assets		4,292
Accounts payable		296
Debt payable within one year		97
Interest payable		2
Income taxes payable		16
Accrued payroll and incentive compensation		32
Current liabilities associated with assets held for sale		70
Current portion of operating lease liabilities		25
Financing fees payable		0
Other current liabilities		106
Total current liabilities		644
Liabilities subject to compromise		0
Long-term debt		1,733
Long-term pension and post employment benefit obligations		232
Deferred income taxes		160
Operating lease liabilities		87
Other long-term liabilities		215
Noncurrent liabilities associated with assets held for sale		66
Total liabilities		3,137
Common stock (Successor)		0
Paid-in capital (Successor)		1,156
Total Hexion Inc. equity (deficit)		1,156
Noncontrolling interest		(1)
Total equity (deficit)		1,155
Total liabilities and equity (deficit)		4,292
Reorganization Adjustments [Member]
Fresh-Start Adjustment [Line Items]
Net cash received		29
Reorganization Adjustments [Member] | Continuing Operations
Fresh-Start Adjustment [Line Items]
Net cash received		29
Accounts receivable (net of allowance for doubtful accounts of $16 and $0, respectively)		0
Finished and in-process goods		0
Raw materials and supplies		0
Current assets held for sale		0
Other current assets		2
Total current assets		31
Investment in unconsolidated entities		0
Deferred tax assets		12
Other long-term assets		4
Land		0
Buildings		0
Machinery and equipment		0
Property, Plant, and Equipment, Gross		0
Less accumulated depreciation		0
Property, Plant, and Equipment, Net		0
Operating lease assets		0
Elimination of Predecessor other intangible assets		0
Noncurrent assets held for sale		0
Total assets		47
Accounts payable		49
Debt payable within one year		(343)
Income taxes payable		11
Accrued payroll and incentive compensation		0
Current liabilities associated with assets held for sale		0
Current portion of operating lease liabilities		0
Financing fees payable		(104)
Other current liabilities		5
Total current liabilities		(387)
Liabilities subject to compromise		(3,664)
Long-term debt		1,622
Long-term pension and post employment benefit obligations		33
Deferred income taxes		1
Operating lease liabilities		0
Other long-term liabilities		72
Noncurrent liabilities associated with assets held for sale		0
Total liabilities		(2,323)
Common stock (Predecessor)		(1)
Paid-in capital (Predecessor)		1,156
Treasury stock (Predecessor), at cost—88,049,059 shares at December 31, 2018		296
Elimination of Predecessor Company accumulated other comprehensive income		0
Accumulated deficit		1,445
Total Hexion Inc. equity (deficit)		2,370
Noncontrolling interest		0
Total equity (deficit)		2,370
Total liabilities and equity (deficit)		47
Predecessor Paid-in-capital		(526)
Repayment of DIP Term Loan interest		(5)
Fresh Start Adjustments [Member]
Fresh-Start Adjustment [Line Items]
Pension liability fair value adjustment		44
Fresh Start Adjustments [Member] | Continuing Operations
Fresh-Start Adjustment [Line Items]
Cash and Cash Equivalents, Fresh Start Adjustment		0
Accounts receivable, Fresh-start adjustments		6
Inventory fair value adjustments		27
Raw Materials, Fresh-start Adjustments		0
Total current assets held for sale		2
Other Current assets, Fresh-start Adjustments		0
Total Current Assets, Fresh-start Adjustments		35
Investment in unconsolidated companies		(6)
Deferred tax assets		(3)
Other long-term assets		(1)
Land, Fresh-start Adjustment		11
Buildings, Fresh-start Adjustments		(118)
Machinery and Equipment, Fresh-Start Adjustments		(837)
Property, Plant, and Equipment, Gross, Fresh-Start Adjustments		(944)
Accumulated Depreciation, Fresh-Start Adjustments		1,566
Property, plant and equipment fair value adjustment		622
Operating lease assets (See endnote X)		33
Goodwill (See endnote Y)		81
Other intangible assets (See endnote Z)		1,138
Total noncurrent assets held for sale		215
Total Assets, Fresh-start Adjustments		2,114
Accounts Payable, Fresh-start Adjustments		0
Debt payable within one year, Fresh-Start Adjustments		2
Interest Payable, Fresh-start Adjustments		0
Income taxes payable, Fresh-start Adjustments		0
Accrued payroll and incentive compensation, Fresh-start Adjustments		0
Current liabilities associated with assets held for sale		1
Current portion of operating lease liabilities (See endnote X)		6
Financing fees payable, Fresh-start Adjustments		0
Other Current Liabilities, Fresh-start Adjustments		0
Total current liabilities, Fresh-start Adjustments		9
Liabilities Subject to Compromise, Fresh-start Adjustments		0
Long-term Debt, Fresh-start Adjustments		21
Pension liability fair value adjustment		(39)
Deferred income taxes		148
Operating lease liabilities, Fresh-Start Adjustments		17
Other Long-term liabilities, Fresh-start Adjustments		(6)
Noncurrent liabilities associated with assets held for sale		20
Fresh-Start Adjustment, Increase (Decrease), Liabilities, Total		248
Common Stock, Fresh-start Adjustments		0
Paid-in-capital, Fresh-Start Adjustments		0
Treasury Stock, Fresh-start Adjustments		0
Accumulated other comprehensive loss, Fresh-start Adjustments		26
Net impact on accumulated deficit		1,840
Total Hexion Inc. equity (deficit), Fresh-start Adjustments		1,866
Noncontrolling interest, Fresh-start Adjustments		0
Total equity (deficit), Fresh-start Adjustments		1,866
Total liabilities and equity (deficit), Fresh-start Adjustments		2,114
Fresh Start Adjustments [Member] | Discontinued Operations
Fresh-Start Adjustment [Line Items]
Inventory fair value adjustments		2
Total current assets held for sale		2
Investment in unconsolidated companies		3
Deferred tax assets		(1)
Other long-term assets		3
Property, plant and equipment fair value adjustment		158
Operating lease assets (See endnote X)		6
Goodwill (See endnote Y)		(11)
Other intangible assets (See endnote Z)		57
Total noncurrent assets held for sale		215
Current liabilities associated with assets held for sale		1
Current portion of operating lease liabilities (See endnote X)		1
Pension liability fair value adjustment		5
Deferred income taxes		15
Noncurrent liabilities associated with assets held for sale		20
Predecessor Company [Member] | Continuing Operations
Fresh-Start Adjustment [Line Items]
Net cash received		96
Accounts receivable (net of allowance for doubtful accounts of $16 and $0, respectively)		421
Finished and in-process goods		221
Raw materials and supplies		89
Current assets held for sale		132
Other current assets		56
Total current assets		1,015
Investment in unconsolidated entities		20
Deferred tax assets		0
Other long-term assets		34
Land		69
Buildings		228
Machinery and equipment		1,948
Property, Plant, and Equipment, Gross		2,245
Less accumulated depreciation		(1,559)
Property, Plant, and Equipment, Net		686
Operating lease assets		89
Goodwill		83
Elimination of Predecessor other intangible assets		(17)
Noncurrent assets held for sale		(187)
Total assets		2,131
Accounts payable		247
Debt payable within one year		438
Interest payable		7
Income taxes payable		5
Accrued payroll and incentive compensation		32
Current liabilities associated with assets held for sale		69
Current portion of operating lease liabilities		19
Financing fees payable		104
Other current liabilities		101
Total current liabilities		1,022
Liabilities subject to compromise		3,664
Long-term debt		90
Long-term pension and post employment benefit obligations		160
Deferred income taxes		11
Operating lease liabilities		70
Other long-term liabilities		149
Noncurrent liabilities associated with assets held for sale		46
Total liabilities		5,212
Common stock (Predecessor)		1
Paid-in capital (Predecessor)		526
Treasury stock (Predecessor), at cost—88,049,059 shares at December 31, 2018		(296)
Elimination of Predecessor Company accumulated other comprehensive income		(26)
Accumulated deficit		(3,285)
Total Hexion Inc. equity (deficit)		(3,080)
Noncontrolling interest		(1)
Total equity (deficit)		(3,081)
Total liabilities and equity (deficit)		$ 2,131