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Quarterly Financial Information (Tables)
 12 Months Ended
Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information (unaudited)
 
2012 Quarter Ended
 
Total
Millions
(except per share
amounts)
March 31
 
June 30
 
Sept. 30
 
Dec. 31
 
Net sales
$
3,752

 
$
3,955

 
$
3,845

 
$
3,648

 
$
15,200

Cost of Sales(1)
2,229

 
2,352

 
2,288

 
2,200

 
9,069

Net income (attributable to PPG)(2)
13

 
362

 
339

 
227

 
941

Earnings per common share
0.08

 
2.37

 
2.21

 
1.47

 
6.13

Earnings per common share – assuming dilution (2)
$
0.08

 
$
2.34

 
$
2.18

 
$
1.46

 
$
6.06

 
2011 Quarter Ended
 
Total
Millions
(except per share
amounts)
March 31
 
June 30
 
Sept. 30
 
Dec. 31
 
Net sales
$
3,533

 
$
3,986

 
$
3,849

 
$
3,517

 
$
14,885

Cost of Sales(1)
2,127

 
2,417

 
2,353

 
2,184

 
9,081

Net income (attributable to PPG)
228

 
340

 
311

 
216

 
1,095

Earnings per common share
1.42

 
2.15

 
1.98

 
1.41

 
6.96

Earnings per common share – assuming dilution
$
1.40

 
$
2.12

 
$
1.96

 
$
1.39

 
$
6.87

(1)
Exclusive of depreciation and amortization.
(2)
First quarter 2012 includes charge of $163 million or $1.06 per diluted share related to restructuring (See Note 7, "Business Restructuring") and charge of $99 million or $0.64 per diluted share related to environmental remediation (See Note 15, "Commitments and Contingent Liabilities").