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Equity (Tables)
 12 Months Ended
Dec. 31, 2011
Equity [Abstract]  
Activity in number of shares of common stock and treasury stock
For the years ended December 31, 2011, 2010, and 2009, activity in the number of shares of common stock and treasury stock was as follows (in millions):
 
Common Stock
 
Treasury
Stock
Balance as of December 31, 2008
627

 
(111
)
Sale of common stock
46

 
—

Transactions in connection with
  stock-based compensation plans:
 
 
 
Stock issuances
—

 
2

Balance as of December 31, 2009
673

 
(109
)
Transactions in connection with
  stock-based compensation plans:
 
 
 
Stock issuances
—

 
5

Stock repurchases
—

 
(1
)
Balance as of December 31, 2010
673

 
(105
)
Transactions in connection with
  stock-based compensation plans:
 
 
 
Stock issuances
—

 
5

Stock repurchases
—

 
(17
)
Balance as of December 31, 2011
673

 
(117
)
Changes in components of accumulated other comprehensive income (loss)
Changes in the balances of each component of accumulated other comprehensive income (loss) were as follows (in millions):
 
Foreign
Currency
Translation
Adjustment
 
Pension/
OPEB
Liability
Adjustment
 
Net Gain (Loss) On Cash Flow Hedges
 
Accumulated
Other
Comprehensive
Income (Loss)
Balance as of December 31, 2008
$
90

 
$
(435
)
 
$
169

 
$
(176
)
Other comprehensive income (loss)
375

 
218

 
(52
)
 
541

Balance as of December 31, 2009
465

 
(217
)
 
117

 
365

Other comprehensive income (loss)
158

 
(18
)
 
(117
)
 
23

Balance as of December 31, 2010
623

 
(235
)
 
—

 
388

Other comprehensive income (loss)
(122
)
 
(189
)
 
19

 
(292
)
Balance as of December 31, 2011
$
501

 
$
(424
)
 
$
19

 
$
96