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Receivables (Tables)
 12 Months Ended
Dec. 31, 2011
Receivables [Abstract]  
Receivables, net
Receivables consisted of the following (in millions):
 
December 31,
 
2011
 
2010
Accounts receivable
$
8,366

 
$
4,299

Commodity derivative receivables
174

 
144

Notes receivable and other
214

 
182

 
8,754

 
4,625

Allowance for doubtful accounts
(48
)
 
(42
)
Receivables, net
$
8,706

 
$
4,583
Changes in allowance for doubtful accounts
Changes in the allowance for doubtful accounts consisted of the following (in millions):
 
Year Ended December 31,
 
2011
 
2010
 
2009
Balance as of beginning of year
$
42

 
$
45

 
$
58

Increase in allowance charged to expense
21

 
14

 
28

Accounts charged against the allowance,
  net of recoveries
(14
)
 
(17
)
 
(42
)
Foreign currency translation
(1
)
 
—

 
1

Balance as of end of year
$
48

 
$
42

 
$
45