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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2016
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
2016
2015
Issued
1,070

1,071

In treasury
(204
)
(215
)
Total shares of common stock outstanding
866

856
Schedule of accumulated other comprehensive income (loss)
Accumulated other comprehensive loss consisted of the following:
 
December 31
Millions of dollars
2016
2015
Defined benefit and other postretirement liability adjustments (a)
$
(313
)
$
(221
)
Cumulative translation adjustment
(80
)
(78
)
Other
(61
)
(64
)
Total accumulated other comprehensive loss
$
(454
)
$
(363
)
(a) Included net actuarial losses for our international pension plans of $290 million at
December 31, 2016 and $205 million at December 31, 2015