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Receivables (Tables) | 12 Months Ended
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Dec. 31, 2015
Receivables [Abstract] |
Receivables, net | Changes in the allowance for doubtful accounts consisted of the following (in millions):
| Year Ended December 31,
| 2015 |  | 2014 |  | 2013
Balance as of beginning of year | $ | 37 |  |  | $ | 46 |  |  | $ | 56 |
Increase in allowance charged to expense | 7 |  |  | 7 |  |  | 13 |
Accounts charged against the allowance, net of recoveries | (9 | ) |  | (15 | ) |  | (23 | )
Foreign currency translation | — |  |  | (1 | ) |  | — |
Balance as of end of year | $ | 35 |  |  | $ | 37 |  |  | $ | 46 |
Receivables consisted of the following (in millions):
| December 31,
| 2015 |  | 2014
Accounts receivable | $ | 4,105 |  |  | $ | 5,509 |
Commodity derivative and foreign currency contract receivables | 147 |  |  | 151 |
Other receivables | 247 |  |  | 256 |
| 4,499 |  |  | 5,916 |
Allowance for doubtful accounts | (35 | ) |  | (37 | )
Receivables, net | $ | 4,464 |  |  | $ | 5,879 |

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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