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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2018
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
2018
2017
Issued
1,069

1,069

In treasury
(198
)
(196
)
Total shares of common stock outstanding
871

873
Schedule of accumulated other comprehensive income (loss) Accumulated other comprehensive loss consisted of the following:
 
December 31
Millions of dollars
2018
2017
Defined benefit and other postretirement liability adjustments (a)
$
(203
)
$
(334
)
Cumulative translation adjustment
(82
)
(80
)
Other
(70
)
(55
)
Total accumulated other comprehensive loss
$
(355
)
$
(469
)
(a) Included net actuarial losses for our international pension plans of $184 million at December 31, 2018 and $295 million at December 31, 2017.