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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2012
Equity [Abstract] |
Accumulated Other Comprehensive Income Attributable to Masco Corporation | Accumulated Other Comprehensive (Loss) Income. The components of accumulated other comprehensive income attributable to Masco Corporation were as follows, in millions:
|  | At December 31 |
|  | 2012 |  |  | 2011 |
Cumulative translation adjustments |  | $ | 501 |  |  | $ | 482 |
Unrealized loss on marketable securities, net |  |  | (12 | ) |  |  | (12 | )
Unrealized loss on interest rate swaps |  |  | (21 | ) |  |  | (23 | )
Unrecognized prior service cost and net loss, net |  |  | (409 | ) |  |  | (371 | )
Accumulated other comprehensive income |  | $ | 59 |  |  | $ | 76 |

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- Definition Accumulated Other Comprehensive Income [Text Block] + References No definition available. + Details
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