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Shareholders' Equity
 9 Months Ended
Sep. 30, 2018
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, 2017
$
8,349

$
8,322

$
27

Retained earnings adjustment for new accounting standard (a)
30

30

—

Payments of dividends to shareholders
(473
)
(473
)
—

Stock plans
370

370

—

Stock repurchase program
(200
)
(200
)
—

Other
(54
)
(49
)
(5
)
Comprehensive income (loss)
995

998

(3
)
Balance at September 30, 2018
$
9,017

$
8,998

$
19


(a) Represents a cumulative-effect adjustment to retained earnings upon our adoption of new accounting standards effective January 1, 2018. See Note 9 for further information on the adoption of the new revenue recognition standard.
Millions of dollars
Total shareholders' equity
Company shareholders' equity
Noncontrolling interest in consolidated subsidiaries
Balance at December 31, 2016
$
9,448

$
9,409

$
39

Retained earnings adjustment for new accounting standard (b)
(384
)
(384
)
—

Payments of dividends to shareholders
(469
)
(469
)
—

Stock plans
340

340

—

Other
(52
)
(46
)
(6
)
Comprehensive income (loss)
363

367

(4
)
Balance at September 30, 2017
$
9,246

$
9,217

$
29


(b) Represents a cumulative-effect adjustment to retained earnings upon our adoption of a new accounting standards update on the income tax consequences of intra-entity transfers of assets other than inventory, which was effective January 1, 2017.
    
Our Board of Directors has authorized a program to repurchase our common stock from time to time. During the quarter ended September 30, 2018, under that program we repurchased approximately 4.8 million shares of our common stock for a total cost of $200 million. Approximately $5.5 billion remained authorized for repurchases as of September 30, 2018.
From the inception of this program in February 2006 through September 30, 2018, we repurchased approximately 206 million shares of our common stock for a total cost of approximately $8.6 billion.
        
Accumulated other comprehensive loss consisted of the following:
Millions of dollars
September 30,
2018
December 31,
2017
Defined benefit and other postretirement liability adjustments
$
(325
)
$
(334
)
Cumulative translation adjustments
(81
)
(80
)
Other
(57
)
(55
)
Total accumulated other comprehensive loss
$
(463
)
$
(469
)