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Shareholders' Equity
 9 Months Ended
Sep. 30, 2012
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, 2011
 
$
13,216

 
$
13,198

 
$
18

Transactions with shareholders
 
241

 
243

 
(2
)
Comprehensive income
 
1,984

 
1,977

 
7

Payments of dividends to shareholders
 
(250
)
 
(250
)
 
—

Balance at September 30, 2012
 
$
15,191

 
$
15,168

 
$
23

Millions of dollars
 
Total shareholders' equity
 
Company shareholders' equity
 
Noncontrolling interest in consolidated subsidiaries
Balance at December 31, 2010
 
$
10,387

 
$
10,373

 
$
14

Transactions with shareholders
 
299

 
299

 
—

Comprehensive income
 
1,937

 
1,933

 
4

Payments of dividends to shareholders
 
(247
)
 
(247
)
 
—

Balance at September 30, 2011
 
$
12,376

 
$
12,358

 
$
18



The tax effects allocated to each component of other comprehensive income for the three and nine months ended September 30, 2012 and 2011 are not material.

Accumulated other comprehensive loss consisted of the following:
Millions of dollars
 
September 30,
2012
 
December 31,
2011
Defined benefit and other postretirement liability adjustments
 
$
(193
)
 
$
(208
)
Cumulative translation adjustments
 
(70
)
 
(66
)
Unrealized gains on investments
 
1

 
1

Total accumulated other comprehensive loss
 
$
(262
)
 
$
(273
)