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Stock Option Plans and Stock Based Compensation Level 4 (Details) - Restricted Unit Activity (USD $)
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12 Months Ended |
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Dec. 31, 2014
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Dec. 31, 2013
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| Schedule of Restricted Stock [Line Items] |
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term |
6 years 0 months |
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| Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |
3,770,036 |
4,230,380 |
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value |
$ 1.94 |
$ 2.07 |
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |
191,030 |
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| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |
$ 1 |
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| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period |
(193,162) |
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| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value |
$ 4.85 |
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| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period |
(458,212) |
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| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value |
$ 2.25 |
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| Restricted Stock Units (RSUs) [Member] |
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| Schedule of Restricted Stock [Line Items] |
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| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term |
0 years 11 months |
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| Hexion LLC 2004 Deferred Compensation Plan [Member] |
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| Schedule of Restricted Stock [Line Items] |
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| Deferred common stock units granted |
1,007,944 |
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| Undistributed Units |
691,570 |
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