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Fair Value of Financial Investments (Details 2) (USD $)	3 Months Ended
Fair Value of Financial Investments (Details 2) (USD $)	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Income from financial investments, net and impairment charges
Equity investments loss, net		$ (2,000,000)
Total income (loss) from financial investments, net	2,000,000mas_IncomeFromInvestments	(1,000,000)mas_IncomeFromInvestments
Estimated market value of long-term and short-term debt	4,300,000,000us-gaap_DebtInstrumentFairValue		3,700,000,000us-gaap_DebtInstrumentFairValue
Aggregate carrying value of long-term and short-term debt	3,900,000,000		3,400,000,000
Private equity funds
Income from financial investments, net and impairment charges
Realized gains from private equity funds	$ 2,000,000	$ 1,000,000

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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