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Receivables (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule of Allowance for Doubtful Accounts | The following table details the changes in the allowance for doubtful accounts related to customer receivables and other receivables:
|  | Customer receivables |  |  | Other receivables |
December 31, |  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
Balance at beginning of year |  | $ | 46 |  |  | $ | 46 |  |  | $ | 79 |  |  | $ | 87 |
Provision for doubtful accounts |  |  | 2 |  |  |  | 19 |  |  |  | 9 |  |  |  | 7 |
Write off of uncollectible accounts |  |  | (8 | ) |  |  | (14 | ) |  |  | (3 | ) |  |  | (3 | )
Recoveries of prior write-offs |  |  | (1 | ) |  |  | (3 | ) |  |  | (6 | ) |  |  | (5 | )
Other |  |  | - |  |  |  | (2 | ) |  |  | (5 | ) |  |  | (7 | )
Balance at end of year |  | $ | 39 |  |  | $ | 46 |  |  | $ | 74 |  |  | $ | 79 |

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- Definition Tabular disclosure of financing receivables (examples of financing receivables include loans, trade accounts receivable and notes receivable) and activity in the allowance for credit losses account. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration