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Shareholders' Equity
12 Months Ended
Dec. 31, 2012
Shareholders' Equity [Abstract]  
Shareholders' Equity
17.      Shareholders' Equity

The following table presents changes in capital stock for the period from January 1, 2010 to December 31, 2012 (in millions):
 
Common stock
 
Treasury stock
 
Shares
 
Par value
 
Shares
 
Cost
                   
Balance at December 31, 2009
1,616
 
$
808 
 
(64)
 
$
(1,207)
                   
Shares issued to benefit plans and for option exercises
10
   
5
         
Other, net
         
(1)
   
(20)
Balance at December 31, 2010
1,626
 
$
813
 
(65)
 
$
(1,227)
                   
Shares issued to benefit plans and for option exercises
10
   
5
       
(7)
Shares purchased for treasury
         
(55)
   
(779)
Other, net
         
(1)
   
(11)
Balance at December 31, 2011
1,636
 
$
818
 
(121)
 
$
(2,024)
                   
Shared issued to benefit plans and for option exercises
13
   
7
       
(1)
Shares purchased for treasury
         
(56)
   
(719)
Other, net
         
(2)
   
(29)
Balance at December 31, 2012
1,649
 
$
825
 
(179)
 
$
(2,773)



Accumulated Other Comprehensive Income (Loss)

A summary of the components of other comprehensive income (loss), including our proportionate share of equity method investee's other comprehensive income (loss), is as follows (in millions):
 
Foreign
currency
translation
adjustment
and other
 
Unamortized
losses and
prior service
costs for post-
retirement
benefit plans
 
Net
unrealized
gains
(losses) on
investments
 
Net
unrealized
gains
(losses) on
designated
hedges
 
Accumulated
other
comprehensive
income (loss)
                             
Balance at December 31, 2009
$
808 
 
$
(1,171)
 
$
(39)
 
$
 
$
(401)
Foreign currency translation adjustment and other
 
566 
                     
566 
Net unrealized gain on investments
             
         
Net unrealized loss on designated hedges
                   
(24)
   
(24)
Net change in unrecognized postretirement benefit plans
       
(104)
               
(104)
Balance at December 31, 2010
$
1,374 
 
$
(1,275)
 
$
(33)
 
$
(23) 
 
$
43
                             
Foreign currency translation adjustment and other
 
(21)
                     
(21)
Net unrealized gain on investments
             
         
Net unrealized loss on designated hedges
                   
(6)
   
(6)
Net change in unrecognized postretirement benefit plans
       
(109)
               
(109)
Balance at December 31, 2011
$
1,353 
 
$
(1,384)
 
$
(29)
 
$
(29)
 
$
(89)
                             
Foreign currency translation adjustment and other
 
(179)
                     
(179)
Net unrealized gain on investments
             
13 
         
13 
Net unrealized gain on designated hedges
                   
47
   
47 
Net change in unrecognized postretirement benefit plans
       
(92)
               
(92)
Balance at December 31, 2012
$
1,174
 
$
(1,476)
 
$
(16)
 
$
18
 
$
(300)

Refer to the Consolidated Statement of Comprehensive Income for further information about the changes in each component.  Tax effects related to each component of comprehensive income are included in Note 6 (Income Taxes) to the Consolidated Financial Statements.