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Receivables (Tables) | 12 Months Ended
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Dec. 31, 2017
Transfers and Servicing [Abstract] |
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, | 2017 | 2016 | 2015 |  | 2017 | 2016 | 2015
Balance at beginning of year | $ | 13 |  | $ | 8 |  | $ | 6 |  |  | $ | 32 |  | $ | 34 |  | $ | 24 |
Provision for doubtful accounts | 1 |  | 7 |  | 4 |  |  | 9 |  | 6 |  | 8 |
Write off of uncollectible accounts | (5 | ) | (3 | ) | (2 | ) |  | (1 | ) | (1 | ) | 2 |
Recoveries of prior write-offs | — |  | (1 | ) | — |  |  | (3 | ) | 1 |  | (1 | )
Other | (1 | ) | 2 |  | — |  |  | (3 | ) | (8 | ) | 1 |
Balance at end of year | $ | 8 |  | $ | 13 |  | $ | 8 |  |  | $ | 34 |  | $ | 32 |  | $ | 34 |

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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=84173941&loc=SL6953423-111524 + Details
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- References No definition available. + Details
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