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Property (Tables)
12 Months Ended
Dec. 31, 2012
Property, Plant and Equipment [Abstract]  
Property
Property
(Millions)
Useful
Lives
(years)
 
2012
 
2011
 
Land and land improvements
5-30
 
$
504

 
$
482

 
Buildings
20-40
 
1,568

 
1,482

 
Machinery and equipment
5-25
 
5,952

 
5,736

 
Other
3-20
 
735

 
694

 
Construction in progress
 
 
271

 
220

 
Total(1)
 
 
$
9,030

 
$
8,614

(1)
Interest capitalized in 2012, 2011 and 2010 was $8 million, $9 million and $7 million, respectively.