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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of pre-tax compensation expense and the related income tax benefit for these stock-based incentives
Pre-tax compensation expense and the related income tax benefit for these stock-based incentives were as follows, in millions: 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2016
 
2015
 
2016
 
2015
Long-term stock awards
$
5

 
$
6

 
$
17

 
$
19

Stock options
1

 
1

 
2

 
5

Phantom stock awards and stock appreciation rights
4

 
—

 
6

 
6

Total
$
10

 
$
7

 
$
25

 
$
30

Income tax benefit (37 percent tax rate)
$
4

 
$
3

 
$
9

 
$
11
Schedule of the Company's long-term stock award activity
Our long-term stock award activity was as follows, shares in millions: 
 
Nine Months Ended
September 30,
 
2016
 
2015
Unvested stock award shares at January 1
5

 
6

Weighted average grant date fair value
$
17

 
$
18

 
 
 
 
Stock award shares granted
1

 
1

Weighted average grant date fair value
$
26

 
$
26

 
 
 
 
Stock award shares vested
2

 
2

Weighted average grant date fair value
$
16

 
$
17

 
 
 
 
Stock award shares forfeited
—

 
—

Weighted average grant date fair value
$
20

 
$
18

 
 
 
 
Forfeitures upon spin off (A) 
—

 
1

Weighted average grant date fair value
$
—

 
$
20

 
 
 
 
Modification upon spin off (B) 
—

 
1

 
 
 
 
Unvested stock award shares at September 30
4

 
5

Weighted average grant date fair value
$
20

 
$
17

 

(A)                  In connection with the spin off of TopBuild, TopBuild employees forfeited their outstanding Masco equity awards.
(B)                  Subsequent to the separation of TopBuild, we modified our outstanding equity awards to employees and non-employee Directors such that all individuals received an equivalent fair value both before and after the separation.  The modification to the outstanding stock awards was made pursuant to existing anti-dilution provisions in our 2014 Plan and 2005 Long Term Incentive Plan
Schedule of the Company's stock option activity
Our stock option activity was as follows, shares in millions: 
 
 
Nine Months Ended
September 30,
 
 
2016
 
 
2015
Option shares outstanding, January 1
 
12

 
 
18

Weighted average exercise price (A)
$
17

 
$
21

 
 
 
 
 
 
Option shares granted
 
—

 
 
—

Weighted average exercise price
$
26

 
$
26

 
 
 
 
 
 
Option shares exercised
 
5

 
 
3

Aggregate intrinsic value on date of exercise (B) 
$
64 million

 
$
32 million

Weighted average exercise price
$
21

 
$
17

 
 
 
 
 
 
Option shares forfeited
 
—

 
 
3

Weighted average exercise price
$
—

 
$
29

 
 
 
 
 
 
Forfeitures upon spin off (C) 
 
—

 
 
—

Weighted average exercise price
$
—

 
$
19

 
 
 
 
 
 
Modification upon spin off (A) 
 
—

 
 
2

 
 
 
 
 
 
Option shares outstanding, September 30
 
7

 
 
14

Weighted average exercise price
$
15

 
$
17

Weighted average remaining option term (in years)
 
4

 
 
4

 
 
 
 
 
 
Option shares vested and expected to vest, September 30
 
7

 
 
14

Weighted average exercise price
$
15

 
$
17

Aggregate intrinsic value (B) 
$
137 million

 
$
111 million

Weighted average remaining option term (in years)
 
4

 
 
4

 
 
 
 
 
 
Option shares exercisable (vested), September 30
 
6

 
 
12

Weighted average exercise price
$
13

 
$
18

Aggregate intrinsic value (B) 
$
117 million

 
$
96 million

Weighted average remaining option term (in years)
 
3

 
 
3

 
 
(A)
Subsequent to the separation of TopBuild, we modified our outstanding equity awards to employees and non-employee Directors such that all individuals received an equivalent fair value both before and after the separation.  The modification to the outstanding options was made pursuant to existing anti-dilution provisions in our 2014 Plan and 2005 Long Term Incentive Plan. The modification contributed to the lower exercise price.
(B)
Aggregate intrinsic value is calculated using our stock price at each respective date, less the exercise price (grant date price), multiplied by the number of shares.
(C)
In connection with the spin off of TopBuild, TopBuild employees forfeited their outstanding Masco equity awards.
Schedule of weighted average grant date fair value of option shares granted and the assumptions used to estimate those values using a Black-Scholes option pricing model
The weighted average grant date fair value of option shares granted and the assumptions used to estimate those values using a Black-Scholes option pricing model were as follows: 
 
Nine Months Ended
September 30,
 
2016
 
2015
Weighted average grant date fair value
$
6.43

 
$
9.67

Risk-free interest rate
1.41
%
 
1.75
%
Dividend yield
1.49
%
 
1.32
%
Volatility factor
29.00
%
 
42.00
%
Expected option life
6 years

 
6 years