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Receivables (Tables)
 12 Months Ended
Dec. 31, 2014
Receivables [Abstract]  
Receivables, net
Receivables consisted of the following (in millions):
 
December 31,
 
2014
 
2013
Accounts receivable
$
5,509

 
$
8,582

Commodity derivative and foreign currency
contract receivables
151

 
98

Other receivables
256

 
117

 
5,916

 
8,797

Allowance for doubtful accounts
(37
)
 
(46
)
Receivables, net
$
5,879

 
$
8,751

Changes in the allowance for doubtful accounts consisted of the following (in millions):
 
Year Ended December 31,
 
2014
 
2013
 
2012
Balance as of beginning of year
$
46

 
$
56

 
$
48

Increase in allowance charged to expense
7

 
13

 
21

Accounts charged against the allowance,
net of recoveries
(15
)
 
(23
)
 
(13
)
Foreign currency translation
(1
)
 
—

 
—

Balance as of end of year
$
37

 
$
46

 
$
56