XML 116 R102.htm IDEA: XBRL DOCUMENT v3.20.4

EMPLOYEE RETIREMENT PLANS - Qualified Defined-benefit Pension Plan Assets at Fair Value by Level within the Fair Value Hierarchy (Details) - Qualified - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair Value
Private equity funds	$ 863,000,000	$ 780,000,000	$ 670,000,000
Valued at NAV	87,000,000	464,000,000
Level 1
Fair Value
Private equity funds	43,000,000	239,000,000
Level 2
Fair Value
Private equity funds	732,000,000	58,000,000
Level 3
Fair Value
Private equity funds	1,000,000	19,000,000
United States | Common and Preferred Stocks:
Fair Value
Private equity funds	113,000,000	167,000,000
Valued at NAV	87,000,000	82,000,000
United States | Private Equity and Hedge Funds – International
Fair Value
Private equity funds		2,000,000
Valued at NAV		0
United States | Corporate Debt Securities:
Fair Value
Private equity funds	143,000,000	198,000,000
Valued at NAV	0	124,000,000
United States | Government and Other Debt Securities:
Fair Value
Private equity funds	214,000,000	151,000,000
Valued at NAV	0	148,000,000
United States | Common Collective Trust Fund – United States
Fair Value
Private equity funds	292,000,000	4,000,000
Valued at NAV	0	0
United States | Short-Term and Other Investments – International
Fair Value
Private equity funds		2,000,000
Valued at NAV		0
United States | Level 1 | Common and Preferred Stocks:
Fair Value
Private equity funds	26,000,000	85,000,000
United States | Level 1 | Private Equity and Hedge Funds – International
Fair Value
Private equity funds		0
United States | Level 1 | Corporate Debt Securities:
Fair Value
Private equity funds	0	74,000,000
United States | Level 1 | Government and Other Debt Securities:
Fair Value
Private equity funds	0	0
United States | Level 1 | Common Collective Trust Fund – United States
Fair Value
Private equity funds	0	0
United States | Level 1 | Short-Term and Other Investments – International
Fair Value
Private equity funds		2,000,000
United States | Level 2 | Common and Preferred Stocks:
Fair Value
Private equity funds	0	0
United States | Level 2 | Private Equity and Hedge Funds – International
Fair Value
Private equity funds		0
United States | Level 2 | Corporate Debt Securities:
Fair Value
Private equity funds	143,000,000	0
United States | Level 2 | Government and Other Debt Securities:
Fair Value
Private equity funds	214,000,000	3,000,000
United States | Level 2 | Common Collective Trust Fund – United States
Fair Value
Private equity funds	292,000,000	4,000,000
United States | Level 2 | Short-Term and Other Investments – International
Fair Value
Private equity funds		0
United States | Level 3 | Common and Preferred Stocks:
Fair Value
Private equity funds	0	0
United States | Level 3 | Private Equity and Hedge Funds – International
Fair Value
Private equity funds		2,000,000
United States | Level 3 | Corporate Debt Securities:
Fair Value
Private equity funds	0	0
United States | Level 3 | Government and Other Debt Securities:
Fair Value
Private equity funds	0	0
United States | Level 3 | Common Collective Trust Fund – United States
Fair Value
Private equity funds	0	0
United States | Level 3 | Short-Term and Other Investments – International
Fair Value
Private equity funds		0
International | Common and Preferred Stocks:
Fair Value
Private equity funds	15,000,000	157,000,000
Valued at NAV	0	110,000,000
International | Private Equity and Hedge Funds – International
Fair Value
Private equity funds	1,000,000	17,000,000
Valued at NAV	0	0
International | Corporate Debt Securities:
Fair Value
Private equity funds	23,000,000	1,000,000
Valued at NAV	0	0
International | Government and Other Debt Securities:
Fair Value
Private equity funds	46,000,000	67,000,000
Valued at NAV	0	0
International | Buy-in Annuity - International
Fair Value
Private equity funds	14,000,000	12,000,000
Valued at NAV	0	0
International | Short-Term and Other Investments – International
Fair Value
Private equity funds	2,000,000	2,000,000
Valued at NAV	0	0
International | Level 1 | Common and Preferred Stocks:
Fair Value
Private equity funds	15,000,000	47,000,000
International | Level 1 | Private Equity and Hedge Funds – International
Fair Value
Private equity funds	0	0
International | Level 1 | Corporate Debt Securities:
Fair Value
Private equity funds	0	0
International | Level 1 | Government and Other Debt Securities:
Fair Value
Private equity funds	0	29,000,000
International | Level 1 | Buy-in Annuity - International
Fair Value
Private equity funds	0	0
International | Level 1 | Short-Term and Other Investments – International
Fair Value
Private equity funds	2,000,000	2,000,000
International | Level 2 | Common and Preferred Stocks:
Fair Value
Private equity funds	0	0
International | Level 2 | Private Equity and Hedge Funds – International
Fair Value
Private equity funds	0	0
International | Level 2 | Corporate Debt Securities:
Fair Value
Private equity funds	23,000,000	1,000,000
International | Level 2 | Government and Other Debt Securities:
Fair Value
Private equity funds	46,000,000	38,000,000
International | Level 2 | Buy-in Annuity - International
Fair Value
Private equity funds	14,000,000	12,000,000
International | Level 2 | Short-Term and Other Investments – International
Fair Value
Private equity funds	0	0
International | Level 3 | Common and Preferred Stocks:
Fair Value
Private equity funds	0	0
International | Level 3 | Private Equity and Hedge Funds – International
Fair Value
Private equity funds	1,000,000	17,000,000
International | Level 3 | Corporate Debt Securities:
Fair Value
Private equity funds	0	0
International | Level 3 | Government and Other Debt Securities:
Fair Value
Private equity funds	0	0
International | Level 3 | Buy-in Annuity - International
Fair Value
Private equity funds	0	0
International | Level 3 | Short-Term and Other Investments – International
Fair Value
Private equity funds	$ 0	$ 0

X

- Definition

Defined Benefit Plan, Net Asset Value of Plan Assets

+ References

No definition available.

+ Details

Name:	mas_DefinedBenefitPlanNetAssetValueofPlanAssets
Namespace Prefix:	mas_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(01)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(01)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(ii)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(ii)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_DefinedBenefitPlanFundedStatusOfPlanAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RetirementPlanTaxStatusAxis=us-gaap_QualifiedPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanSponsorLocationAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=mas_CommonAndPreferredStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=mas_PrivateEquityAndHedgeFundsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_USTreasuryAndGovernmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=mas_CommonCollectiveTrustFundMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=mas_ShortTermAndOtherInvestmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanSponsorLocationAxis=us-gaap_ForeignPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_ForeignGovernmentDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=mas_BuyinAnnuityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: