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Shareholders' Equity
6 Months Ended
Jun. 30, 2011
Shareholders' Equity [Abstract]  
Shareholders' Equity [Text Block]
Note 5. Shareholders' Equity
The following tables summarize our shareholders' equity activity.

         
Noncontrolling
 
   
Total
  
Company
  
interest in
 
   
shareholders'
  
shareholders'
  
consolidated
 
Millions of dollars
 
equity
  
equity
  
subsidiaries
 
Balance at December 31, 2010
   $10,387    $10,373   $        14 
Transactions with shareholders
  181   181            - 
Comprehensive income:
            
Net income
  1,252   1,250             2 
Other comprehensive income
  3   3            - 
Total comprehensive income
  1,255   1,253             2 
Payments of dividends to shareholders
  (165)  (165)           - 
Balance at June 30, 2011   $11,658    $11,642   $        16 

         
Noncontrolling
 
   
Total
  
Company
  
interest in
 
   
shareholders'
  
shareholders'
  
consolidated
 
Millions of dollars
 
equity
  
equity
  
subsidiaries
 
Balance at December 31, 2009
   $8,757    $8,728   $        29 
Transactions with shareholders
  96   98           (2)
Comprehensive income:
            
Net income
  690   686            4 
Other comprehensive income
  4   4           - 
Total comprehensive income
  694   690            4 
Payments of dividends to shareholders
  (163)  (163)          - 
Balance at June 30, 2010   $9,384    $ 9,353   $       31 

The following table summarizes comprehensive income for the quarterly periods presented.

   
Three Months Ended
 
   
June 30
 
Millions of dollars
 
2011
  
2010
 
Net income
    $741     $483 
Other comprehensive income (loss)
  1   (3)
Total comprehensive income
    $742     $480 
Comprehensive income attributable to noncontrolling interest
  2   3 
Comprehensive income attributable to company
  740   477 

       Accumulated other comprehensive loss consisted of the following:

   
June 30,
  
December 31,
 
Millions of dollars
 
2011
  
2010
 
Defined benefit and other postretirement liability adjustments
   $    (176)    $    (175) 
Cumulative translation adjustments
        (64)         (66) 
Unrealized gains on investments
           3            1 
Total accumulated other comprehensive loss
   $    (237)    $    (240)