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Operations and summary of significant accounting policies (Tables)
 12 Months Ended
Dec. 31, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive income (loss), net of tax, included in Statement 4, consisted of the following at December 31:
 
 
 
 
 
 
 
 
 
 
December 31,
(Millions of dollars)
 
2012
 
2011
 
2010
Foreign currency translation
 
$
456

 
$
206

 
$
551

Pension and other postretirement benefits
 
(6,914
)
 
(6,568
)
 
(4,695
)
Derivative financial instruments
 
(42
)
 
(10
)
 
45

Available-for-sale securities
 
67

 
44

 
48

Total accumulated other comprehensive income (loss)
 
$
(6,433
)
1 
$
(6,328
)
 
$
(4,051
)