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Receivables (Tables)
 12 Months Ended
Dec. 31, 2012
Receivables [Abstract]  
Receivables, net
Receivables consisted of the following (in millions):
 
December 31,
 
2012
 
2011
Accounts receivable
$
8,061

 
$
8,366

Commodity derivative and foreign currency
contract receivables
136

 
174

Notes receivable and other
26

 
214

 
8,223

 
8,754

Allowance for doubtful accounts
(56
)
 
(48
)
Receivables, net
$
8,167

 
$
8,706
Changes in allowance for doubtful accounts
Changes in the allowance for doubtful accounts consisted of the following (in millions):
 
Year Ended December 31,
 
2012
 
2011
 
2010
Balance as of beginning of year
$
48

 
$
42

 
$
45

Increase in allowance charged to expense
21

 
21

 
14

Accounts charged against the allowance,
net of recoveries
(13
)
 
(14
)
 
(17
)
Foreign currency translation
—

 
(1
)
 
—

Balance as of end of year
$
56

 
$
48

 
$
42