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Shareholders' Equity
 6 Months Ended
Jun. 30, 2015
Stockholders' Equity Note [Abstract]  
Stockholders' Equity
Shareholders’ Equity
The following tables summarize our shareholders’ equity activity:
Millions of dollars
Total shareholders' equity
Company shareholders' equity
Noncontrolling interest in consolidated subsidiaries
Balance at December 31, 2014
$
16,298

$
16,267

$
31

Payments of dividends to shareholders
(306
)
(306
)
—

Stock plans
254

254

—

Other
(44
)
(42
)
(2
)
Comprehensive income (loss)
(487
)
(488
)
1

Balance at June 30, 2015
$
15,715

$
15,685

$
30

Millions of dollars
Total shareholders' equity
Company shareholders' equity
Noncontrolling interest in consolidated subsidiaries
Balance at December 31, 2013
$
13,615

$
13,581

$
34

Shares repurchased
(500
)
(500
)
—

Stock plans
357

357

—

Payments of dividends to shareholders
(254
)
(254
)
—

Other
(26
)
(22
)
(4
)
Comprehensive income
1,395

1,400

(5
)
Balance at June 30, 2014
$
14,587

$
14,562

$
25



Our Board of Directors has authorized a program to repurchase our common stock from time to time. Approximately $5.7 billion remains authorized for repurchases as of June 30, 2015. From the inception of this program in February 2006 through June 30, 2015, we repurchased approximately 201 million shares of our common stock for a total cost of approximately $8.4 billion.
        
Accumulated other comprehensive loss consisted of the following:
Millions of dollars
June 30,
2015
December 31,
2014
Defined benefit and other postretirement liability adjustments
$
(318
)
$
(326
)
Accumulated gain on cash flow hedges
106

—

Cumulative translation adjustments
(75
)
(70
)
Other
(11
)
(3
)
Total accumulated other comprehensive loss
$
(298
)
$
(399
)