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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2015
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
2015
2014
Issued
1,071

1,071

In treasury
(215
)
(223
)
Total shares of common stock outstanding
856

848
Schedule of comprehensive income (loss)
Accumulated other comprehensive loss consisted of the following:
 
December 31
Millions of dollars
2015
2014
Defined benefit and other postretirement liability adjustments (a)
$
(221
)
$
(326
)
Cumulative translation adjustment
(78
)
(70
)
Unrealized loss on cash flow hedge
(67
)
—

Other
3

(3
)
Total accumulated other comprehensive loss
$
(363
)
$
(399
)
(a) Included net actuarial losses for our international pension plans of $205 million at
December 31, 2015 and $298 million at December 31, 2014