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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2012
Stockholders' Equity Note [Abstract]  
Schedule of shares of common stock
The following table summarizes total shares of common stock outstanding:
 
December 31
Millions of shares
2012
2011
2010
Issued
1,073

1,073

1,069

In treasury
(144
)
(152
)
(159
)
Total shares of common stock outstanding
929

921

910
Schedule of comprehensive income (loss)
Accumulated other comprehensive loss consisted of the following:
 
December 31
Millions of dollars
2012
2011
2010
Defined benefit and other postretirement liability adjustments (a)
$
(241
)
$
(208
)
$
(175
)
Cumulative translation adjustment
(69
)
(66
)
(66
)
Other
1

1

1

Total accumulated other comprehensive loss
$
(309
)
$
(273
)
$
(240
)
(a)
Included net actuarial losses for our international pension plans of $208 million at December 31, 2012, $184 million at December 31, 2011, and $170 million at December 31, 2010.