Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Masco Corporation's shareholders' equity:
Common shares, par value	$ 1	$ 1
Common shares, authorized	1,400,000,000	1,400,000,000
Common shares, issued	347,500,000	348,600,000
Common shares, outstanding	347,500,000	348,600,000
Preferred shares, authorized	1,000,000	1,000,000
Preferred shares, issued	0	0
Preferred shares, outstanding	0	0

Face amount or stated value of common stock per share; generally not indicative of the fair market value per share.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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