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Research and Development
12 Months Ended
Dec. 31, 2012
Research and Development [Abstract]  
Research and Development
Research and Development
(Millions)
2012
 
2011
 
2010
Research and development – total
$
470

 
$
445

 
$
408

Less depreciation on research facilities
15

 
15

 
14

Research and development – net
$
455

 
$
430

 
$
394