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Shareholders' Equity
 6 Months Ended
Jun. 30, 2013
Equity [Abstract]  
Shareholders' Equity
Shareholders’ Equity
The following tables present the change in total shareholders’ equity for the six months ended June 30, 2013 and 2012, respectively:
(Millions)
Total PPG
Shareholders’
Equity
 
Non-
controlling
Interests
 
Total
Balance, January 1, 2013
$
4,063

 
$
259

 
$
4,322

Net income
2,751

 
65

 
2,816

Other comprehensive income, net of tax
27

 
(11
)
 
16

Cash dividends
(171
)
 
—

 
(171
)
Issuance of treasury stock
60

 
—

 
60

Purchase of treasury stock
(140
)
 
—

 
(140
)
Stock-based compensation activity
14

 
—

 
14

Increase in treasury stock (Note 5)
(1,562
)
 
—

 
(1,562
)
Reduction in non-controlling interests (Note 5)
—

 
(16
)
 
(16
)
Dividends paid on subsidiary common stock to noncontrolling interests
—

 
(38
)
 
(38
)
Balance, June 30, 2013
$
5,042

 
$
259

 
$
5,301

 
(Millions)
Total PPG
Shareholders’
Equity
 
Non-
controlling
Interests
 
Total
Balance, January 1, 2012
$
3,249

 
$
197

 
$
3,446

Net income
375

 
72

 
447

Other comprehensive income, net of tax
7

 
(2
)
 
5

Cash dividends
(177
)
 
—

 
(177
)
Issuance of treasury stock
80

 
—

 
80

Purchase of treasury stock
(92
)
 
—

 
(92
)
Stock-based compensation activity
19

 
—

 
19

Dividends paid on subsidiary common stock to noncontrolling interests (a)
—

 
(52
)
 
(52
)
Other changes in noncontrolling interests
—

 
(1
)
 
(1
)
Balance, June 30, 2012
$
3,461

 
$
214

 
$
3,675


(a) - $13 million of this amount relates to noncontrolling interests of the commodity chemicals business separated in January 2013 (see Note 5). As such, this amount is presented in the condensed consolidated statement of cash flows within "Cash used for financing activities - Discontinued Operations".