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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
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
2017
2016
Issued
1,069

1,070

In treasury
(196
)
(204
)
Total shares of common stock outstanding
873

866
Schedule of accumulated other comprehensive income (loss)
Accumulated other comprehensive loss consisted of the following:
 
December 31
Millions of dollars
2017
2016
Defined benefit and other postretirement liability adjustments (a)
$
(334
)
$
(313
)
Cumulative translation adjustment
(80
)
(80
)
Other
(55
)
(61
)
Total accumulated other comprehensive loss
$
(469
)
$
(454
)
(a) Included net actuarial losses for our international pension plans of $295 million at December 31, 2017 and $290 million at December 31, 2016