Name:	usg_ClosingPricePerShareOfContributedSharesToRetirementPlanTrust
Namespace Prefix:	usg_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

Defined benefit plan contributions by employer in cash and common stock.

No definition available.

Name:	usg_DefinedBenefitPlanContributionsByEmployerInCashAndCommonStock
Namespace Prefix:	usg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Defined benefit plan contributions by employer in common stock.

No definition available.

Name:	usg_DefinedBenefitPlanContributionsByEmployerInCommonStock
Namespace Prefix:	usg_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Discounted value shares valued for purposes of crediting the contribution to trust.

No definition available.

Name:	usg_DiscountedValueSharesValuedForPurposesOfCreditingContributionToTrust
Namespace Prefix:	usg_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

Discount rate used to valued shares for purposes of crediting the contribution to the trust.

No definition available.

Name:	usg_DiscountRateUsedToValuedSharesForPurposesOfCreditingContributionToTrust
Namespace Prefix:	usg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	usg_EmployeeRetirementPlansAdditionalTextualAbstract
Namespace Prefix:	usg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	usg_EmployeeRetirementPlansTextualAbstract
Namespace Prefix:	usg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Rate at which shares valued for purposes of crediting the contribution to trust.

No definition available.

Name:	usg_RateAtWhichSharesValuedForPurposesOfCreditingContributionToTrust
Namespace Prefix:	usg_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

The increase in the fair value of plan assets from contributions made by the employer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)(3)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

Name:	us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan in the current remaining fiscal period. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.

No definition available.