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Separation and Merger Transaction Separation and Merger Transaction (Tables)
12 Months Ended
Dec. 31, 2012
Business Combinations [Abstract]  
Schedule of Subsequent Events
 
Year-ended
Millions
2012
 
2011
 
2010
Net sales
$
1,688

 
$
1,732

 
$
1,434

Income before income taxes
$
345

 
$
376

 
$
187

Income tax expense
$
117

 
$
126

 
$
68

Income from discontinued operations, net of tax
$
228

 
$
250

 
$
119

Less: Net income attributable to non-controlling interests, discontinued operations
$
(13
)
 
$
(13
)
 
$
(8
)
Net income from discontinued operations (attributable to PPG)
$
215

 
$
237

 
$
111